1. Click the 'Start' button on the desktop and then click the 'All Programs' icon.
2. Click on 'Accessories' and right-click on the 'Command Prompt' option.
3. Click on the 'Run as administrator' button and then type your administrator password into the field that appears.
4. Type 'sfc /scannow' (without the quotation marks) into the command prompt and press the 'Enter' key.
5. Wait for the scan to complete and then restart your computer to clear the OCX error.