Key,
To stop a service:
Right click My Computer - Manage - Services & applications.
or
Control Panel - Admin Tools - Services
Then Double click on the service, see if STOP works, if not then change startup type to disabled and save and reboot.
At some point when everything is the way you want it, go in and START the service - and return it to startup type - automatic (or manual, if that's what it was).
Of course, if it doesn't run as a service (I thought all AV programs did for security) then this won't help.
SD