microsoft vitrual pc 2007 works really nice. It's a backwards compatibility dream... I am running the Beta of it right now (god damn 64bit vista business dropped support for 16bit apps....) HOWEVER, it recognizes your pc as a Pentium 3 and reserves approximately 256mb of ram (could be changable never looked) along with generic audio and video... Don't expect to play anything more complicated than solitare on the thing. CPU wise, i think its open. it recognized a e6300 as a 1.8ghz p3... I will run benchmarks with Adobe Premiere when i get a chance.