Longhorn "Verification Mode"
After changing some system settings in Longhorn in Virtual PC, and deciding just to “turn off” the window, the next time I started up, Longhorn was running very slowly. After a while, a piece of toast popped up explaining Longhorn was in “Verification Mode” due to the crash. It then allowed me to disable it, by brining up an “Is system allowed to run in verification mode?” dialog. Very interesting... perhaps this is the next evolution of Safe Mode?