nt services missing

On an NT4 sp6 server running exchange 5.5, when you open the services from control panel about half of the services are missing. Do ‘net start’ from a command prompt and all the services are listed. What happened to the rest of the services from the control panel ‘services’ icon? Also, I always have to delete the \exchsrvr\imcdata folder before the IMC service will start, anyone have clues?