Usually when you uninstall something, associated service is removed with the software, but sometimes it lingers on.

In order to remove service manually you need to:

• Click Start -> Run… -> type in "regedit"
• Find the registry entry
  HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services
• Find the service you need to remove and delete the entry.
  Note: Check what files are used by the service as you might also want to remove them as well.
• Restart Windows.