Why do I receive an error message when you try to watch live TV in Windows Media Center on a Windows Vista-based computer: "Restricted Content - Display Driver"?
There can be a few different things that can cause this error. First thing you will need to check is your video card and your monitor or television to make sure they are both HDCP compliant.
If they are HDCP compliant then you may want to first check for any new Windows Updates. If there are any updates available go ahead and download and install them.
You may also want to make sure that your video card drivers are up to date. Visit the manufacturer's website of your video card and download the newest display drivers and install them.