The System File Checker tool scans system files and replaces incorrect versions of the system files by using the correct versions.
To run the System File Checker tool, follow these steps:
1. Click StartStart button, and then type cmd in the Start Search box
2. Right-click cmd in the Programs list, and then click Run as administrator.
If you are prompted for an administrator password 0r for confirmation, type your password, 0r click Continue.
3. At the command prompt, type the following, and then press ENTER: sfc /scannow When the scan is complete, test to see whether the issue that you are experiencing is resolved.
Note If you encounter an error when you try to run the System File Checker, just ignore the error, and go to the next troubleshooting method. Some errors that you may encounter when you run the System File Checker may be resolved as soon as you successfully install Windows Vista SP1.
4. Follow the prompts to complete the system scan.
If Windows Resource Protection finds corrupted files and is unable to fix some of them, just go to the next troubleshooting method. Even if Windows Resource Protection finds corrupted files and is unable to fix some of them, you may still be able to successfully install Windows Vista SP1.
When the scan is complete, test to see whether the issue that you are experiencing is resolved
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