How to Check DLL Files

1. Click 'Start,' then 'All Programs.'
2. Click 'Accessories,' then right-click on 'Command Prompt.'
3. Click 'Run as administrator' from the pop-up menu. Click 'Allow' or type in an administrator password if prompted by the system.
4. Type 'sfc /scannow' at the command prompt, then press the 'Enter' key. The System File Checker will run. It will check for all missing and corrupted DLL files and replace them.