Hotfix available to prevent Media Player 10 setup from breaking content protection in Media Center 2005
I previously described a scenario where installing Media Player 10 on top of Update Rollup 2 for Media Center 2005 can cause errors playing back content that is protected by digital rights management (DRM). We are still working on a fix that will repair the DRM store on machines that are already in a bad state, but in the meantime there is an additional hotfix (KB910393) that just became available that will prevent Media Player 10 from allowing you to install and revert DRM files.
As described in the knowledge base article for this issue, this hotfix will not fix the Secure Storage Protection Error on systems that are experiencing the problem. However, this update will prevent the problem by stopping the Microsoft Windows Media Player 10 installation package from overwriting certain DRM files.