Photoshop displays image files radically wonky

[WalterAlter]

I recently reinstalled XP on my computer and installed Photoshop CS2. All went well for a week or so and then the colors started displaying radically incorrectly on any graphics file type I opened. My desktop colors are normal, only the graphics file within Photoshop displays incorrectly. The weird part is that Photoshop Elements displays the images correctly! and so does my image/thumbnail viewer, Irfan View. Also, I happened to open a PDF file in Acrobat and the image files in that document were also totally whack, like in Photoshop. by totally whack, I mean that blue displays as saturated magenta, Yellow displays as green, etc. I'm thinking there might be a corruption in something common to both Photoshop CS2 and Acrobat, but why Elements is not affected is a mystery. Does it handle color information differently than CS2 and Acrobat?

I've tried all the suggested solutions- tweaking the gamma, color profiles, reinstalling video drivers, lowering screen resolution and pixel depth. I also tried uninstalling CS2 and installed an copy of Photoshop 7 with no improvement. This leads me to believe that the problem is outside the installed Photoshop files, but common to Photoshop and Acrobat.

I cleaned the registry with Registry Mechanic. Nothing has worked. I have 512k of memory, a Diamond S85 128mb DDR Radeon 9250 AGP card installed. Previous to the Win XP install, Photoshop worked fine. Along with the fresh XP install, I installed some new programs, maybe there's a conflict...

Any suggestions will be most welcome,
Walter