Save all of your stuff on an outside hard drvie, then use the restore disks, That is the last option. but I must say that I had to do that, over 50% of the time.
If you can still boot up, spend 30 or 40 bucks to back up your personal stuff, on an a hand held drive. if you can’t boot up, well, I can only suspect that your computer crashed upon trying to establiblish Microsofts SP2. My computer crashed four times trying to do that. Absolute solution, purchase a cheap serial port thing to back up tour stuff, disconnect it, then follow the Mfr’s thing to place your computer to an out of the “out of the box state”, if you have patience, you can do this. I’m saying if your off of the internet, you cant access the internet, you can’t be infecetd. Good luck.
It sounds easier to download and run that superantisypware.