BSOD after installing CIS 3.8.65951.477 X32


I´ve updated from CIS 3.5.57173.439 X32 to 3.8.65951.477 X32 with online update. The install was successfully.

After restart I had a BSOD “C000021A” with the message “The NT Initial Command Process system process terminated unexspectedly”.

The BSOD was under Vista X32 and under Vista SP1 X32 the same.

What´s the matter?


I had the same problem, gave up, un installed new version. Reinstalled old version, which seemed to work. I then removed the old version, used Microsoft Windows Install Clean up and did a clean installation of 3.8.65951.477 which I am using now. I paid the pro version fee to get support, but have not heard back with any explanation as to why the BSOD. I saw several references to this on forum and general internet search. But no answers. I may have missed something, but I did not see any warning to uninstall previously installed versions. May be just my and your mix of software installed? I like the firewall, but it seems just when I find something I like, they change it and I’m forced to fight to get things working something like it used to. It is a FRED (Fairly Ridiculous Electronic Device). I sent my question and got a ticket number on 2.22.2009.
Hope this is of some help?

The Bug Check 0xC000021A occurs when a user-mode subsystem has been fatally compromised and security can no longer guaranteed. In response, the operating system switches to kernel mode.

Running the kernel mode debugger is not useful in this situation because the actual error occurred in a user-mode process.

I think, the device driver packet installation of COMODO network service or COMODO network adapter causes the error.

Resolving an error in a user-mode device driver:
If the error occured after the installation of a new or updated device driver, the new software should be removed or disabled and should be asked the manufacturer of the software about a possible update.

Please COMODO give us an update of the bad software!


Try uninstalling Comodo and reboot.

After reboot run Comodo System Cleaner and clean up the registry. Then delete all folders related to CIS under:
Program Files
Program Files\Common Files\
Users%username%\Appdata\Local\Virtual store\ .

Then open Device Manager → View → show hidden devices. Look under non Plug and Play drivers for Comodo related driver → uninstall it and reboot.

Now try installing CIS again. Does that help?