Note
If you remove Windows Media Player 11 and the Windows Media Format 11 Runtime, and then encounter error C00D271D ("A problem has occurred in the Digital Rights Management component. Contact Microsoft product support."), you might be able to resolve the problem by installing the Windows Media Format 9.5 Runtime. For information about installing the Runtime, in the Microsoft Knowledge Base, see article 891122, "Update for Windows Media Digital Rights Management-enabled players."
You might not be able to roll back to a previous version of the Player if the hidden folder $NtUninstallwmp11$ is deleted from your computer. Some non-Microsoft programs (such as CCleaner) delete this folder in an attempt to remove unwanted files from your computer.