Blender 2.5 grayed out screen

I’ve been having trouble with Blender 2.5. whenever I use the program it starts out fine but after a few moments the various windows within the program begin reverting to solid gray. My computer has been kind of funky for awhile when it comes to graphics but I never had this problem with the previous version of Blender. Any ideas on how to fix this or could it just be I need a new video card?
-Sir Baggiepants