Run syustem file checker which should replace any corrupted files.
Using System File Checker
You can use System File Checker to verify the integrity of your operating system files, to restore them if they are corrupted, and to extract compressed files (such as drivers) from your installation disks.
You can have System File Checker back up the existing files before restoring the original files. You can also customize search criteria based on folder and file extension.
to start System File Checker.
Note
You can also start System File Checker by clicking Start, pointing to Programs, pointing to Accessories, pointing to System Tools, and then clicking System Information. In System Information, click Tools, and then click System File Checker.