Available cleaning software non booting virus infected desktop

I have a Dell Dimension 4400 desktop that apparently has a nasty virus infection. It will only boot in safe mode. I have been quoted $260 to clean the data and to restore Windows 2000 Professional NT. In addition they are quoting another $315. to reload the software and data. Is there any software to accomplish this at a lower cost? I would like to recover specific files if not all of them.