This is how to delete a service on windows that has not been automatically removed by a software uninstall you need to edit the registry:
- Start the registry editor (regedit.exe)
- Move to the HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices key
- Select the key of the service you want to delete
- From the Edit menu select Delete
- You will be prompted “Are you sure you want to delete this Key” click Yes
- Exit the registry editor
There is also a utility that is supplied with the NT resource kit called INSTSRV.EXE that can be used to install and remove services
instsrv <service name> remove
Alternatively, also with the resource kit is a utility SRVINSTW.EXE that again installs and removes services, but with a GUI wizard format allowing you to select the service either locally or remotely.