lex400sc

Okay, as you might know, my Photoshop 5.5 has not been working since I reformatted my computer. I've been installing older versions of Photoshop since, Photoshop 4.0 and then the Photoshop 5.0 Upgrade. When I installed Photoshop 4.0, it screwed up my Windows system! In Win2k all the folders have an image preview sidebar, but when I installed PS 4.0, they stopped working! Does anyone know how to bring this feature back? Does anyone have a Photoshop 6.0 or 7.0 disc I can borrow? This really sucks because I have a bunch of pictures I want to post up, and I'm also due up for a new sig, but I can't do anything without Photoshop!