There are a number of boot options that can be used in Vista and Windows Server 2008 that can be a pain to modify (or not possible if you are in a bugcheck loop), that can be done on the fly at boot time. These options are invaluable for diagnosing some problems you may experience on the system, and modifying them in the OS may involve figuring out the bcdedit syntax, the right BCD store to modify, or rebuilding and burning a new install DVD (if the problem is happening during install from media).
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