Eraser doesn't erase your OS - it erases either individual files or the freespace on your drive. You need to thoroughly
read and understand the Eraser "Help" section before attempting to use the program.
From the sound of things, your computer's in really bad shape - you may wind up
having to wipe the entire drive just to get rid of whatever it is you've actually gotten on there. Hopefully not.
Go here:
http://www.spywareinfoforum.com/index.p ... opic=79038 and follow the instructions given
to the letter, in the order given.
Eraser is
not a "malware-fixing" tool. Pete