Color Profile

I'm using Photoshop CS2.

I just switched to a new computer 1 month ago, and after installing Photostop into my new computer, for some reason the color profile seem to have messed up.

When I am opening a image, the image will show up lighter than original in PS. But when I switch my PS's color profile to my monitor color, the image will be fixed back to it's original color, however, if I save it, the image will end up very dark.

Hope you understand what I'm trying to say, this problem is driving me crazy.

Thank you.