Just updated Parallels to 5.0.9310. Booted up Windows 7 successfully, installed updated Parallels Tools, rebooted, and first got a message telling me that Windows Genuine Advantage has detected that I was not running an authorized copy of Windows (not the case, by the way). Chose to register later with Microsoft to resume the boot, but the screen was nothing but black. Closed the session and booted it up again, and this time just got the black screen. What's going on?!!