My laptop runs Windows 7 Ultimate, and I can play Thief 3 just fine. I might have had to make a few minor tweaks to get it to setup properly, but if I did, it wasn't any more elaborate than what I had to do to install TW on the same machine. In theory there are ways to get at least Thief 2 running as well, but I haven't had any success yet. Thief 1 is more likely to run on an XP machine, but even that requires some work. The various fan communities have posted possible solutions--try Google for a good overview of what's available.It would be great if GoG got a Square Enix/Eidos deal that gives us the Thief series, but no such luck yet.