DefragFs: PerfectDisk failed to start correctly.
Hit any key to restart immediately. Restarting in 10 seconds.
Starting optimization for C:\
Volume is not dirty
Failed to open volume using Defrag32 (32, 538).
Could not gain exclusive access to drive C:\ (32)
There is a possible driver conflict. (C:\)
Go to this registry key (via regedit):
Open the value named "BootExecute"
The normal entry for ME there is:
autocheck autochk *
Delete anything else that's in there, restart, and try doing another offline system file defrag. Should work now.