Are you a Netflix user, have problems watching Netflix video on Windows 7 Media Center after installing Internet Explorer 9 Release Candidate (RC)? The Netflix application in Windows Media Center may encounter an error when it initiates video playback after you install IE9 RC on Windows 7. Microsoft has released a fix for that issue.
To fix this problem automatically, visit here and click the Fix it button to download a file. Then run it and follow the steps in the Fix it Wizard.
Advanced users can fix it manually. Press Win +R keys to enable the run command box. Type regedit.exe to open the registry editor.
Exit Registry Editor. Check out this KB article (KB2512239) for details. (via)