I ran the Tweaking.com Window Repair all in one (tweaking.com_windows_repair_aio_ setup.exe) on Nov 17,2014 to hopefully fix a Windows update problem (see KB2884256 update fails, Dexcom driver install fails thread). Today when I tried to run a computer backup it failed (see attached photos). I tried a system restore to Nov 15. That failed for the same reason (see photo), shadow copies could not be created . I then did a system restore using the repair feature of the Windows installation disk. That worked, and I was then able to do a proper backup. Do you have any ideas of what happened?