Very few, around 10%: Amongst the several tens games I own, I stopped playing Silver because despite nice it was so buggy to always crash, I couldn't get Shogo to run acceptably due to graphics card incompatibility, I stopped Myth III because it was utter crap and an unacceptable insult to Myth I and II, I couldn't install a gift copy of Ultima Online due to audio incompatibility. Them apart, I suspended playing Planescape: Torment, Temple of Elemental Evil, Thief III and Morrowind for various reasons, but I plan to catch up and finish them all, except perhaps ToEE (I must patch Thief III to run on my dual core though, and most probably I'll have to do the same to GPL, as it crashes quite often, and it didn't on my previous single core). I have some games I still have to start, when I have time.