This does sound like a Graphics card problem to me as well. i used to have the same problem, but to the smallest degree, like for example, i remember seeing about 10 differnt groups of 4 pixels missing from the windows sign when i would start up my computer and it was loading teh desktop. GL fixing the problem, and dude, most graphic cards have warrenty on them, usually a 1 year warrenty or even a lifetime warrenty, check urs out. hopefully urs came with a warrenty D:
Then again hopefully it is something else thats wrong, something that is cheaper o.o