For months, my internal 1TB had been partitioned 750GB/250GB OS X 10.6/Windows 7, with no problems - I want to use Windows, I either reboot and hold Alt, then choose Windows when the menu comes up, or I go System Preferences > Startup Disk and change it to "Boot Camp". A few days ago I shrank the 10.6 partition by 200GB using Disk Utility, then formatted the space as Mac OS Extended and installed the preview of OS X 10.7 Lion (I was invited to try it via the AppleSeed programme). Since then, the only options I have in System Prefs > Startup Disk or when holding Alt during boot are 10.6 and 10.7 - Boot Camp seems to have vanished as a choice. If I open Disk Utility, Boot Camp is still there, still 250GB. If I browse the Boot Camp partition in OS X I can see all my Windows files, etc, it just seems to be gone as a bootable option Help!