Originally Posted by Florio
Press the Windows Key + R to open the Run dialogue. Type cmd and press enter. In Command Prompt, type the following two commands (or copy and paste them), one after the other, pressing Enter between each one.
takeown /f "C:\Program Files\Windows Media Player\Skins\Revert.wmz"
icacls "C:\Program Files\Windows Media Player\Skins\Revert.wmz" /grant:r Administrators:f
Do not make any changes to the commands, just copy them over. Tell me if any errors are reported.
You should now be able to replace the file.