I had the same problem. This solved it for me
Close Media Center
Click on the Start menu, choose run and type cmd
Type: regsvr32.exe atl.dll
Type: cd \windows\ehome
Type: ehSched /unregServer
Type: ehSched /service
Type: ehRecvr /unregServer
Type: ehRecvr /service
Type: ehRec.exe /unregServer
Type: ehRec.exe /regserver
Type: ehmsas.exe /unregServer
Type: ehmsas.exe /regserver
Restart Media Center