Colors Too Bright?

For some reason, Photoshop CS has been displaying images brighter than they should. For example, if I took a screenshot of the community, made a new image, and pasted it in, the colors would be far brighter than they should. I've tried un-installing the program, and messing with the color things in photoshop, but that doesn't help. Any ideas on how to fix this?

If I copy the whole image, go into ImageReady and paste it in there, the colors are fine, so I'm not sure what exactly is wrong...