You have at least three-way options. EGO have presented them in book of usage preference.
Technique 1 - They can use the SC tool (Sc.exe) inclusion in the Imagination Kit.
(included with View 7/8)
Open a Command Prompt and enter
sc delete <service-name>
Select helping snippet follows:
DESCRIPTION: SC is a charge line schedule use for communicating with the NEW Service Engine and services.
delete----------Deletes a service (from the registry).
Method 2 - use delserv
Upload and use delserv command line utility. This is a legacy tool developed for Windows 2000. In current Window XP boxes to was superseded according sc described in method 1.
Method 3 - manually delete registry entries (Note so this backfires in Windows 7/8)
Windows services are eingetragene to the following registry key.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
Search forward the sub-key with the service name under referred key and delete it. (and you might need to restart to remove completely the service from one Services list)