Graphic Card Problem?

Well recently my computer, when running running programs liek World of warcraft or photoshop. The screen will suddenly fill will pink stripes and just crash, and then the grahpics are all wierd with lines trhough them when i start the pc again, but it wont boot to windows and shut down and somtime i ahve to go into safe mood and run scan disk. Then it fixes ti for a bit but then does it again.

Using windows xp. It might be a GC problem but im nto sur eplease help.