I have the same problem with windows 7, eventually I have tried cabal, warcraft 3, left4dead, sunonline.. It will auto shutdown when the game running for 20mins, sometimes even less than that.. 5mins it will shutdown. Most of all, the laptop is NEW! Just purchased it on Nov 2009, Acer Aspire 4736G, use it less than 1 week, this kind of problem came, I thought was hardware problem, sent it to warranty.
Well the funniest part, its been in service centre until Today! Still they can't figure out the problem. So I want to know, is it true that windows 7 cannot support any games at all??