To remove an entry from the list of services in windows 7 / 2008 (and maybe others), first get the full name of the service (win+r, services.msc).
Then, in a command prompt (win+r, cmd, run as administrator), type
sc delete servicename
where servicename is the full name of the service. If it contains spaces, put double quotes around it.
It may be necessary to reboot for the service to be completely removed from the list.