Misschien dat dit helpt, anders weet ik het ook niet
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Windows Media Player cannot switch to full screen. You might encounter this error message for one of the following reasons:
The display settings for the Windows operating system are not configured to support full screen. Open Display in Control Panel, click the Advanced button, click the Troubleshoot tab, and then try setting Hardware acceleration to Full. For more information about display settings, see Windows Help.
You do not have the latest version of Microsoft DirectX® installed. To install the latest version of DirectX, see the DirectX page at the Microsoft Web site or the Windows Update page at the Microsoft Web site.
Your video device might require an updated driver. To determine if an updated driver is available, see the Windows Update page at the Microsoft Web site, or see the video device manufacturer's Web site.