If you do, pull the drive and hook it up on another computer
I've used these solution to help two people I know to recover files they need after getting a virus. I have an old PC that I don't use for any other purpose. I remove their hard drive and install it into this PC and make it a slave. I boot from the master drive and use an external CD burner to extract and save their critical files.
After that I reformat their hard drive and restore their operating system, do a virus scan, reload application software and restore data.