I need to be able to run a 32 and 64 bit version of windows 7 pro and solidworks 2011 on one machine. I have a few programs and SW add ins that only work on 32 bit.I would like to know the general consensus of which approach multi OS users prefer. Rebooting to switch OS isn't too big of hassle, but if SW and OS work just as good on virtual PC, I would prefer not to reboot each time. From what I've read a OS on virtual PC runs slower than if it were native. Any one tried both? Thanks