| Yeah, you don't really want to delete that file unless it's corrupted and in that case you'd replace it with a back up.|
Scanreg creates a backup of that file along with the registry and win.ini. Booting to command prompt via F8 or exiting windows and choosing 'restart in msdos mode' will allow you to run SCANREG/RESTORE from the prompt and replace those files with an older version you choose.
Or you can run something like winzip and open one of the RB00?.cab files in the windows\sysbckup folder. You can then extract just system.ini and copy it over the one you're having problems with.
Real men don't use AntiVirus; they just reformat