I work in the R&D Dept. of HP, so I have access to HP's MSDN account (For testing purposes only ofcourse). I downloaded the latest VIsta release: RC2 Ultimate. I wanted to look around and see how some of my apps work with it so first thing I did was install aclohol 120%. Long story short... I made Vista blue screen withing 3 minuets of installation. The best part is, It's blue screening at startup. I have to completely reinstall Windows in order to fix it.