upgrade problems (yep, again)

tried everything in previous posts about upgrading from 2.3 to 2.4. Basically, same problems about un-installing, except “A sharing violation occurred while accessing c:\WINDOWS\system32\drivers\cmdmon.sys” popped up. Went to regedit and found “comodo group” key, and clicked delete all files and sub keys. Went to msconfig, clicked on start up, but could not find anything for comodo. Went under "search all files/folders for comodo and was able to delete most of them, but when i click on "Comodo c:/files, i cannot delete file because this pops up “CANNOT DELETE ESigil.dll. Access Denied Make sure disc is not full or write-protected and that the file is not currently in use”. When i click to open file, all that is in it is the “VEngine”. There is 1 more file under search, but i can’t open it (something about a location that is unavailable or the information has been moved to a different location.) The only firewall i have on now is the XP2 SP2 Windows firewall, don’t know if any of comodo is still working or not. Also went to add-remove programs and clicked on remove, so now no icon or anything except what is written above.