I use Comodo myself. I think there's actually a very simple option to remove a quarantined virus if you check the "Quarantine" section in the Command Center (or whatever the Comodo interface is called).
The virus should be displayed in a list (with its path) where you can just right-click on it and delete it. I know it sounds a bit too simple...but I read into it and it's actually supposed to be done that way. Once in quarantine, the file no longer poses a danger to your system and should be removable without any problems.