Troubleshooting

For what reason do you need to restore the computer?

There is a knowledge thread at http://social.technet.microsoft.com/Forums/en-US/w7itpr... that should point you in the right direction.

The gist of the troubleshooting at the link is first to boot into safe mode and disable AV software you may be running, and doing a "clean boot" by disabling startup services and programs, then running an SFC scan to check for damaged files,

Use the System File Checker tool (SFC.exe) to determine which file is causing the issue, and then replace the file. To do this, follow these steps:

Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
Type the following command, and then press ENTER:
sfc /scannow
The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.

Thanks for the suggestion. It did find and replace some corrupted files. Many thanks.