|Just for grins have you tried running system restore as administrator?|
1. Click Start, and then type System Restore in the Start Search box.
2. Right-click System Restore, and then click Run as administrator.
3. In the System Restore dialog box, click Next.
4. Select a restore point, and then click Next.
5. In the "Confirm your restore point" window, click Finish.
Thanks for any input.