well ok, why does your monitor need to shut off after 2 minutes? Does it really need that much protection so you don't get image burn? If you want a problem fixed, sometimes the easy solutions are the best. Turn off auto power off, and use screen saver (as you said screen saver is fine)
That way your games won't get interrupted. I run Vista 32, and have auto power off, but haven't had this issue, so i dunno, maybe your PC is weird.