You will get this error if you're using Win XP. I had to manually go into the registry editor to stop this app management. To do this...
Start > run > regedt32
Then open up the corresponding classes...
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AppMgmt]
So, HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > AppMgmt
Once in there, go to the start label in the panel on the right, and edit the value from 3 to 4.