Using Win98? I had that strange problem not quite sure what happened.
Sometimes right clicking the desktop and going to refresh helped, sometimes
not. But think about it. If it were a heat related problem do you think it
would just change the appearance of the icons? No. It would change
everything (at least everything graphically intensive). Try running a 3d
game next time it happens, and see if it runs correctly.

-- MiniDisc_2k2
To reply, replace nospam.com with cox dot net