To reset it turn it off then on again.
Right click My Computer then click Properties the System Restore.
Turm off > Turn On
This should reset the service.
Also:
As a first response you might want to post a HijackThis log for review by our Pros in that section:
Please follow the instructions
HERE & then post your log in a new thread in the
Spyware, Adware, Viruses and HijackThis Logs section.
(Not in this section please).
Please specify what issues you appear to be experiencing along with your log.