This is the second time I’ve had a copy of Comodo working just perfectly on a machine, and suddenly due to an updating error, suddenly become useless and seemingly unfix-able.
So, virus definitions were out of date. I updated, rebooted and waited for a time, and the definitions database still claimed it was out of date. I attempted to update a few more time, with no joy.
I uninstalled Comodo, reinstalled, and now it says that the database has never been updated. I update it, reboot, and the same again.
Really disappointed, as I used to swear by Comodo, but over the last month I have experienced this bug twice on two different machines.
I had the same problem with my Comodo Internet Security on a WinXP 32-bit pc.
I tried several things, even a clean install of Windows XP but the problem wasn’t solved by that. I also reinstalled Comodo of course, but that didn’t work as well. The diagnostics of Comodo didn’t report a program failure.
Now I’ve virus updates by NOT hiding the progress-screen of the virus update. Maybe it’s a coincidence, but my virus database is up-to-date now!
I hope you can solve your problem with this information!