Can't view images

I was just connected to my brother's computer pulling a image off of it that I had just scanned secounds ago. And then, suddenly, I am unable to view any images. I can open them in programs like Photoshop, MS Paint, ect, but there are no thumbnails, and I can't open the image in the image viewer.
I am currently in the proccess of running virus scans in safe-mode, but I want to know if anyone here has a clue of what this may be so that I can get back to my normal computing life.


Oh, and I'm running XP pro.

Scan your computer for viruses.