If that dont work, do this:
Reset Windows Media DRM by deleting all the files in the Windows Media DRM folder. Note that the Windows Media DRM folder is a hidden system folder. To view hidden files and folders, follow these steps:a. Click Start, and then click My Computer.
b. On the Tools menu, click Folder Options, and then click the View tab.
c. Click Show hidden files and folders, and then click to clear the Hide protected operating system files check box.
The following are the typical locations of the Windows Media DRM folder, depending on your operating system version: Microsoft Windows 2000 and Windows XP: C:\Documents and Settings\All Users\DRM
Windows 98: C:\Windows\All Users\DRM
Windows Millennium Edition: C:\Windows\DRM
If you cannot find the Windows Media DRM folder, the exact location of the folder on the computer is stored in the following registry key:
Note By default, the path is displayed in binary format. To see the path in plain-text format, double-click DataPath. In the Edit Binary Value dialog box, the path is displayed in the column on the right.
Then go here to update your DRM
Security component upgrade