New computer, Windows 8.1, everything working fine so far, except: all changes to settings done in Control Panel (from desktop) are lost on restarting computer. It's somehow defaulting to never updating Windows, and the power settings are also reset etc. (haven't checked every possible setting, but seems to be a general reset to some sort of undesirable default). Have searched widely for solution to this, and can't find anything, other than a ref. to registry key NoSaveSettings problems, but this doesn't occur anywhere in my registry. Checked for viruses with Malwarebytes and M. Antirootkit, and Bitdefender. I'm not aware of any installed programs likely to do this. Any ideas on this welcome, as I'm completely at a loss.