Windows Desktop Manager is disabled

Following a recent windows update my Aero desktop stopped working. If I run the diagnostic tool it tells me Windows Desktop Manager (WDM) is disabled. What I have done so far:

Run a full system scan - Norton 2013 - No issues

Re-run the Windows performance tool - 7.6 score

Re-started Desktop Windows Manager (DWM) and Themes from the Services tool many times - Checked it is correctly set at Automatic

Checked the registry setting for DWM - All normal, matches my laptop which has no issues.

Updated to the latest NVidia driver for Win 7 Ultimate 64 Bit - Even though old driver was fine until the Windows update

Checked my profile - no issues

Logged off and on again as Administrator - same problem

Rolled back to several restore points in the past - same problem

Anyone have any other ideas - Things were fine and had been since I installed Win7 until the Windows update, since then no WDM

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