I downloaded en_windows_vista_ultimate_sp2_checked_build_x86_dvd_342432.iso from MSDN and tried to install it under Parallels Desktop for Mac 6.0.11992 (625164 12/17/2010) on OS X 10.6.6. This is to create a new VM. It fails to detect the operating system version, so I selected Vista and did NOT check 64 bit. I entered the license key. It starts the procedure OK, and sometimes gets as far as Expanding Files. But it always dies with a BSOD about how it was crashing to prevent the machine from being damaged, etc. I tried it with that file, with that file under a short name, and with that ISO burned to a DVD using Disk Utility. What could the problem be? I've had good luck with XP (in the past) and with Win7 (last week, in this exact configuration).