Comodo Firewall does not always leave quietly. Plenty of readers land on this page after the normal Windows uninstaller has already failed, frozen halfway through, or finished the job while quietly leaving files, registry entries and a stray network driver behind. If you’re trying to uninstall Comodo Firewall and the usual route isn’t working, you’re not doing anything wrong. This is a common issue with security software that hooks deep into Windows to do its job. Below, we cover three ways to remove it (the standard Settings method, the official cleanup tool, and a manual approach for stubborn installs), how to fix the internet connection if it drops afterwards, and what to run instead once Comodo is gone.
Table of Contents
Why Comodo Firewall Can Be Difficult to Remove
It helps to understand why the standard uninstaller sometimes refuses to finish, since it changes how you approach the fix rather than just repeating the same failed attempt. Comodo Firewall doesn’t just filter traffic at the network level; it also runs a Host Intrusion Prevention System (HIPS), known as Defense+, along with a sandbox that isolates unfamiliar programs before they can run freely on your system.
Both of those components come with a built-in Self-Protection feature, designed to stop malware from disabling the firewall to sneak past it. That’s a genuinely useful design in normal use, but it works just as well against a legitimate uninstaller trying to remove the same files. When Self-Protection is still active in memory, Windows’ own removal tools, and sometimes even Comodo’s uninstall wizard, can be blocked from deleting core files or unloading the network driver cleanly. That’s precisely why the methods below escalate from the standard route, through the official cleanup tool, to a manual removal done in Safe Mode, where Self-Protection never gets the chance to load in the first place.
Before You Uninstall Comodo Firewall: Three Things to Check First
A few minutes of preparation saves a lot of frustration later. Before you uninstall Comodo Firewall, back up anything important, create a System Restore point, and confirm you have another firewall ready to take over the moment Comodo is removed.
- Back up your files and settings. If you’ve customised any firewall rules or network exceptions you want to keep, note them down or take screenshots. Once Comodo is gone, that configuration goes with it.
- Create a System Restore point. Open the Start menu, search for “Create a restore point,” and set one manually before you begin. If anything goes wrong during removal, this gives you a way back without a full reinstall.
- Line up a replacement firewall. Never leave a Windows PC without any firewall running, even for a few minutes. Windows Defender Firewall is already built into Windows 10 and 11 and switches on automatically once Comodo is out of the way, so in most cases you don’t need to install anything new before you start. This matters beyond convenience too: under the NCSC’s Cyber Essentials scheme, every device connecting to the internet, including home workers’ laptops, has to sit behind a properly configured firewall, and Windows Defender Firewall satisfies that requirement on its own. UK business users should check their compliance documentation reflects the change before they finish the removal.
It’s also worth checking Windows itself is current before you start, since some display glitches during uninstallation are actually unrelated update issues. Our guide to keeping your software updated covers how to check this in a couple of minutes.
Method 1: Uninstall Comodo Firewall From Windows Settings
For most installs, the standard Windows removal tool still works and takes only a few minutes. Try this first before moving on to anything more involved, since it’s the quickest way to uninstall Comodo Firewall when the software hasn’t become corrupted.
On Windows 11
Open Settings, then go to Apps > Installed apps. Scroll or search for “Comodo Firewall,” click the three-dot menu next to it, and select Uninstall. Confirm the prompt, and follow whatever removal wizard Comodo’s own installer opens. Restart your PC once it finishes, since some drivers only unload fully on reboot.
On Windows 10
Open Settings, select Apps, then Apps & features. Find Comodo Firewall in the list, click it, and choose Uninstall. As with Windows 11, follow the prompts through to completion and restart afterwards.
If the entry has already vanished from the list, or the uninstall wizard closes without doing anything, Comodo’s own Self-Protection module is usually blocking it. That’s the point where Method 2 or Method 3 below becomes necessary.
The table below gives a quick sense of which method suits your situation, so you’re not working through all three in sequence unless you actually need to.
| Method | Best for | Technical difficulty | Typical result |
|---|---|---|---|
| Windows Settings | First attempt, recently installed copies | Low | Works in most straightforward cases |
| Official cleanup tool | Settings uninstall fails or leaves files behind | Low to medium | Removes almost all traces automatically |
| Manual (Safe Mode + registry) | Self-Protection blocks both methods above | Medium to high | Complete removal, but needs careful handling |
Method 2: Uninstall Comodo Firewall Using the Official Cleanup Tool
When the Settings method won’t run or leaves obvious traces behind, Comodo publishes its own cleanup utility specifically for this situation. It’s usually the fastest way to uninstall Comodo Firewall after the standard route has already failed.
The tool is distributed as an executable, commonly named along the lines of CisCleanupTool_x64 (or _x86 for older 32-bit systems), and is shared through Comodo’s official support forum rather than the main download page, so search for “Comodo cleanup tool” alongside the word “official” to make sure you land on a genuine copy. Comodo has released several versions of this tool over the years, so if one build refuses to run cleanly on your version of Windows, check the forum thread for a newer release before assuming the tool itself is broken.
Once downloaded, right-click the file and choose Run as administrator. This step isn’t optional: the tool needs elevated permissions to touch the protected system files and registry keys that Comodo’s Self-Protection feature normally shields. Running it without administrator rights typically results in a silent failure, where the tool appears to finish but leaves the same files behind as the Settings method.
Follow the prompts, allow it to finish uninstalling all Comodo components it finds, and restart when prompted. Two restarts are sometimes needed, since Windows can only release certain locked files after a reboot. If the tool itself won’t launch or closes immediately, that’s usually a sign that Self-Protection is still active in memory, which means it’s time to move on to Method 3 and remove it from Safe Mode instead, where that protection never gets a chance to start.
Method 3: Manually Remove Comodo Firewall When the Standard Uninstall Fails
Occasionally, both the Settings uninstaller and the cleanup tool stall, usually because Comodo’s Self-Protection driver is still active in the background and refusing to let its own files be touched. In that situation, manual removal is the only option left to fully uninstall Comodo Firewall, and it requires a bit more care.
Delete Leftover Folders in Safe Mode
Restart your PC into Safe Mode (hold Shift while clicking Restart, then choose Troubleshoot > Advanced options > Startup Settings > Restart, and press the number for Safe Mode). Booting this way prevents most of Comodo’s background processes from loading, including Self-Protection, so its files no longer resist deletion.
Once in Safe Mode, open File Explorer and go to C:\Program Files\COMODO and C:\Program Files (x86)\COMODO (whichever exist on your system), then delete both folders. Also check C:\ProgramData\COMODO, which often holds leftover logs and configuration data that the standard uninstaller skips, and empties out a surprising amount of disk space once removed.
Clean Up the Registry
Registry edits carry real risk if done carelessly, so only continue if you’re comfortable in the Registry Editor and have already created a restore point. Press Windows key + R, type regedit, and press Enter. Work through the locations in the table below, right-clicking each COMODO-named key you find and selecting Delete.
| Registry location | What it usually contains | Action |
|---|---|---|
HKEY_LOCAL_MACHINE\SOFTWARE\COMODO | Core program settings and licence data | Delete the entire key |
HKEY_CURRENT_USER\SOFTWARE\COMODO | Per-user configuration and sandbox preferences | Delete the entire key |
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services (entries starting “cmd” or “cis”) | Driver and service registrations | Delete matching entries only |
These locations account for the vast majority of leftover Comodo registry data. Take care to check the name of each key carefully before deleting anything under CurrentControlSet\Services, since this location also holds entries for drivers you need to keep. Once you’re confident the relevant keys are gone, close the Registry Editor, empty the Recycle Bin, and restart normally.
Fixing Internet Problems After You Uninstall Comodo Firewall
This is the step most guides skip, and it’s the reason a lot of readers end up here in the first place. Comodo Firewall installs its own network filter driver that sits directly in the Windows network stack. If the uninstall doesn’t fully unhook that driver, it can end up orphaned, still bound to your network adapter but no longer managed by anything, which is what causes the internet to disappear right after you uninstall Comodo Firewall.
To check for this, open Control Panel > Network and Internet > Network Connections, right-click your active adapter (Wi-Fi or Ethernet), and choose Properties. Look through the list of items for anything referencing “COMODO” or “Firewall Driver.” If you find one, untick it, click OK, and restart your PC. If it’s greyed out or won’t untick, select it and click Uninstall instead, then restart.
If the connection still doesn’t return, open Device Manager, expand Network adapters, right-click your adapter, and select Uninstall device, ticking the option to remove the driver software if it’s offered. Windows will reinstall a clean default driver on restart, which resolves the issue in almost every remaining case.
If you’re on a laptop and Wi-Fi has stopped working while a wired connection still works (or the other way round), check both entries under Network adapters individually, since Comodo’s filter driver can attach to one interface without affecting the other. It’s also worth disabling and re-enabling the affected adapter first, since that alone occasionally clears a stuck driver binding without needing a full reinstall.
Post-Removal Checklist: Confirm Comodo Firewall Is Fully Gone
Once you’ve worked through the steps above, it’s worth spending two minutes confirming the removal actually stuck rather than assuming it did. A quick check now saves a repeat visit to this guide later.
Open Task Manager and check the Processes and Services tabs for anything starting with “cmd,” “cis,” or “COMODO.” Open Services (search for it in the Start menu) and scroll to find it. If any are still listed, they’re safe to leave stopped, but their continued presence usually means a folder or registry key was missed in Method 3. Finally, reopen Network Connections and confirm your adapter’s properties list no longer shows a Comodo driver, and that you can browse normally.
What to Use Instead: Firewall Options for UK Households and Businesses
A PC should never run without firewall protection for longer than the time it takes to restart, so it’s worth deciding on a replacement before you uninstall Comodo Firewall rather than after.
For most home users, Windows Defender Firewall is genuinely sufficient. It’s built into Windows 10 and 11, updates automatically alongside the rest of the operating system, and needs no separate licence or configuration to start protecting a typical home network. For UK small businesses that need broader antivirus, VPN and parental control features bundled in with firewall protection, our comparisons of antivirus software providers and ransomware protection features cover which suites include the strongest firewall components alongside their malware scanning. If your setup includes a home router as part of your network boundary, our guide to configuring your router’s firewall is worth reading alongside whatever software firewall you choose, since the two work at different layers of your network.
Uninstalling Comodo Firewall is rarely a single-click process, particularly once Self-Protection or a leftover network driver gets involved, but by working through the standard method, the official tool, and the manual steps in order, you can get a stuck install off your system without needing to reinstall Windows. If you’ve hit a step that behaved differently on your setup, or found a fix that isn’t covered above, let us know in the comments below so we can keep this guide accurate for the next reader working through the same problem.
Frequently Asked Questions About Uninstalling Comodo Firewall
A handful of questions come up repeatedly from readers working through this process, so we’ve answered the most common ones here directly.
Does Comodo have an official uninstaller tool?
Yes. It’s distributed through Comodo’s own support forum as a standalone cleanup executable, separate from the main installer, and is designed specifically for situations where removal of Windows Settings has already failed.
How do I force-uninstall Comodo if it’s missing from the Settings app?
Boot into Safe Mode first, since this stops Comodo’s Self-Protection driver from loading and blocking file deletion, then manually remove the COMODO folders under Program Files and ProgramData as described in Method 3 above.
Why did my internet stop working after I removed Comodo?
Comodo installs a network filter driver that can remain attached to your network adapter if the uninstall doesn’t complete cleanly. Removing or reinstalling the adapter driver through Device Manager, as covered above, resolves this in almost every case.
Is it safe to delete Comodo’s registry keys manually?
Only once you’ve created a System Restore point first. After that, deleting the specific COMODO keys under HKEY_LOCAL_MACHINE\SOFTWARE and HKEY_CURRENT_USER\SOFTWARE is low-risk, since you’re targeting named keys rather than editing system defaults.
Can I just use Windows Defender instead of Comodo?
For most home users, yes. Windows Defender Firewall is built in, free, and meets the baseline firewall requirement under schemes like Cyber Essentials without any extra configuration.
Do I need to restart more than once during this process?
Often, yes. Windows can only release certain locked driver and system files after a reboot, so if you’ve run both the cleanup tool and a manual folder deletion, plan for two restarts rather than one.
Is Comodo Firewall still worth using instead of removing it?
Comodo still ships regular updates and remains a genuine option for users who want granular, rule-by-rule control over network traffic and don’t mind spending time on configuration. For anyone who wants firewall protection that works with no ongoing setup, Windows Defender Firewall or one of the paid suites covered in our antivirus comparisons is generally the simpler choice, which is exactly why so many readers end up removing Comodo rather than troubleshooting it further.
Will removing Comodo Firewall affect other Comodo products I have installed, like Comodo Antivirus?
Not directly, since the firewall and antivirus components can usually be uninstalled independently. That said, if you installed the full Comodo Internet Security suite rather than the standalone firewall, check the Apps list afterwards, as some shared components and background services are only removed when the last remaining Comodo product is uninstalled.