Fix a clr20r3 Error

1. Click Start button, click All Programs, click Accessories, then right-click Command Prompt, in the right click menu, please click Run as administrator.
2. Type the following commands, press Enter after each line. 

regsvr32 atl.dll
cd C:\WINDOWS\eHome
ehSched /unregServer
ehSched /service
ehRecvr /unregServer
ehRecvr /service
ehRec.exe /unregServer
ehRec.exe /regserver
ehmsas.exe /unregServer
ehmsas.exe /regserver