This is for games, of course. :P
The computer in question is Win XP SP3 Home Edition Dell Dimension XPS Intel Pentium 4 2.80 GHz 1 GB RAM w/ Radeon 9800 Pro video card. And lol I don't know what half of what I just typed means, but suffice it to say it's an old (~6 years) computer that was fairly top-of-the-line when I got it.
The games I noticed the problem on were Tropico 3 (invisible people/buildings) and Street Fighter IV (invisible menu, maybe everything else).
On an interesting sidenote, I can play Modern Warfare I on lowest settings, but I can't get Worms World Party to run for some reason. :P