I inserted my computer's original backup disk in order to get it to reboot out of the blue screen, but the system can' read the disk and goes right back to the blue screen error 0x8000ffff. The system recovery can't complete recovery.
This is a generic error code usually seen associated with failed updates. Can you boot to safe mode? If you can, you can run system restore to try to get back to a working configuration. If this does not work try using your Win7 disk and selecting a repair option. In the event that fails, you may have to reinstall windows.