I had a problem with my mediacenter the Media Status Aggregator Service (ehmsas.exe) crashes often.

Solution:

Go to c:\windows\eHome\

unreg the ehmsas.exe and red it agin:

Type: ehmsas.exe /unregServer
Type: ehmsas.exe /regserver
Restart Media Center

It solved my problem with the service.

If it does not help try to run the following to rereg all MCE components:

Start >run and type in: cmd

in the Command Prompt window type the following commands and press the Enter key after the each command:-
Type: regsvr32.exe atl.dll
Type: cd \
Type: cd windows
Type: cd 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