I have the same problem. I solved by this way.. very simple. follow these steps.
1) Boot with safe mode
2)create another one administrator user account
3)Go to control pannel > programs and features and click on Turn Windows features on or off then this window will appear in that just uncheck the Windows Media Center
4)Restart your computer.. your problem solve..
>> login your old user account and install Ccleaner free tool to clean unwanted temp files, cookies, etc you can download from this link CCleaner - CNET Download.com
>> Make a clean everything and registry. clean two, three times.. then you can delete ur newly created user account and enable your media center as mentioned above...
I hope you solved!!!same like me..,