Try this.
* Rightclick the Windows desktop and choose Personalize.
* Click "Display Settings".
* In the Display Settings dialog box, click "Advanced Settings..."
* On the resulting dialog box, click the "Troubleshoot" tab.
* Click "Change Settings"
* You'll probably see a User Account Control message box asking for permission to continue. Click "Continue"
* On the resulting Display Adapter Troubleshooter dialog box, move the slider one notch to the left.
* Click OK as many times as needed/close any windows that opened along the way, and return to the Windows desktop.