Should be able to check for the presence of this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Services\7971f918-a847-4430-9279-4a52d1efe18d
Should be able to check for the presence of this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Services\7971f918-a847-4430-9279-4a52d1efe18d