well obviously you have to reinstall Impulse before you restore those archives; that's like trying to open *.doc files without without MS Word. the option to restore archives is in the Orb, so you don't have to go to My Games at all; just point Impulse at the archive files and it'll do it's job.
on that note; the archive files don't need to be an a specific place either.
since i've had to explain that; i'm concerned you're in above your head when it comes to reinstalling Windows. are you absolutely sure you've got the discs for every program you need, as well as the drivers for all your hardware?
if you don't have those, don't nuke Windows until you do.
(and no, i don't need any smart arse pointing out the other programs that can open *.doc files. XP)