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