|Do the following to check and restore protected system files:|
1. 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.
2. Type the following command, and then press ENTER:
[Note the single space after sfc]
Always pop back and let us know the outcome - thanks