Try this:
Re-install Silverlight
Video players sometimes contain corrupted files that need to be deleted. Please follow the steps below to fully remove Silverlight from your computer and to reinstall it:
Close your Internet browser.
Uninstall/delete your Microsoft Silverlight plugin:
Mac OS X:
Double-click the Hard Driveicon on your desktop.
Navigate to your Internet Plug-Insdirectory: /Library/Internet Plug-Ins/.
Drag any of the following files you may see into your trash bin:
Silverlight.plugin
WPFe.plugin
Open your Internet browser.
Go to
http://www.microsoft.com/getsilverlight/and follow instructions to reinstall latest version of Microsoft Silverlight.
Close and restart your Internet browser.
Return to the video page and retry the video that gave you the error message.
Enabling Microsoft Silverlight DRM Support
Open your Silverlight Configuration Tool.
Mac OS X:
Navigate to the Applicationsfolder on your Mac hard drive.
Double-click the Microsoft Silverlightshortcut to open the configuration tool.
Choose the Playbacktab.
Click Enable download and updates to components required for protected content playback.
Close the menu and reopen your Internet browser.
Return to the video page and retry the video.
Repairing your Microsoft Silverlight DRM Hardware Configuration
If you encountered an error message that told you have a bad DRM Hardware Configuration file while trying to watch a video, follow the steps below.
Close all browser windows and completely exit your Internet browser.
Locate and delete the MS Silverlight DRM Configuration file on your hard drive.
Mac OS X:
Use the spotlight utility to find the file mspr.hdsor navigate to the following location:
[main hard drive]/Library/Application Support/Microsoft/PlayReady/mspr.hds
Delete the file mspr.hds.
Reopen your Internet browser.
Return to the video page and retry the video.