Re: C drive formatting issue in XPS model
I've seen this happen when Internet explorer 10 is installed. The answer is to uninstall the update KB2670838.
Problem is when you do that it removes IE10 altogether and reverts back to IE9 (no big deal IMO).
If you have Windows Update set to auto install updates then you will need to change that otherwise IE10 will be re-installed and Aero will break again.
To uninstall KB2670838 go to Control Panel > Uninstall a Program > View Installed Updates (top left hand side of screen). You will find the entry listed under "Microsoft Windows" as shown below. Click on the entry to uninstall and follow all screen instructions.
Some users have reported that re-installing IE10 from this link http://windows.microsoft.com/en-gb/internet-explorer/ie-10-worldwide-languages fixes the issue but I cannot confirm this.
Note: If you do re-install IE10 and the problem doesn't reappear then set Windows Update back to "Automatically Install" if you so wish.