I tried installing comodo antivirus. Every time windows starts up, i get a message from windows it can not install comodo because it could not locate a specific file. I tried deleting comodo and reinstalling it but it would not delete and an error message indicating e-mail scanner could not be deleted results. Please assist in deleting comodo so it would not prompt windows for installation.

My best advice is to look for the Comodo Directory under C:/Program Files. I’d then run CCleaner (Free Utility Found here: Download CCleaner | Clean, optimize & tune up your PC, free!)
to clean temporary files and to check the registry for errors which will remove any left behind comodo registry entries then reboot.