When a service is removed from any Microsoft Windows operating system, to date, the system must be rebooted, to completely remove the service. After restarting the operating system, the service entry should be deleted. If the service still appears in the Services MMC, or a "specified service already exists" error is displayed upon installing a fresh copy of the service, you'll probably need to tweak the registry, to manually remove the service key.
BE VERY CAREFUL, WHEN EDITING THE SYSTEM REGISTRY!
- Execute regedit.exe
- Windows Vista/2008 and newer: type "regedit" in the start menu search box
- Older versions: click the "Run" option, located in the start menu
- Press the Enter key, to launch
- Back up your registry
- Click file menus: File > Export...
- Select a location to save the registry backup file
- Click the Save button
- Using the tree menu, navigate to: HKEY_LOCAL_MACHINE > SYSTEM> CurrentControlSet > services
- Locate the child node of "services" that matches the service you need to delete
- Press the delete key on the keyboard -- a delete confirmation appears
- Click the Yes button, in the delete confirmation -- the registry key is deleted
- Close the registry editor