I'm not sure if this is possible, but...

I have two hard drives that are important: one is my 500GB SATA drive running Windows XP Pro, that basically has everything I've done in the last three years on it. The other is a 80GB IDE drive that has Windows 7 Ultimate installed on it currently that doesn't have anything on it I can't bear to part with.

My question is, is there any way I can set up one of them as a secondary drive I can access through the other, just long enough to transfer the files dearest to me to the IDE drive so I can format the SATA (it's full of spyware and the like I can't seem to get rid of, and I want to upgrade it to Windows 7 as well), or is this something that just isn't possible?