SERVICES . MSC
To stop programs and unused services.
Click START click RUN and in the RUN BOX TYPE SERVICES . MSC (lower case text) HIT ENTER this will open the SERVICES window and shows everything running on your PC click /highlight on any one and XP will tell you about it (top left) and if you double click it a window will open that will give you the option (to stop it running, start it running, to put it on hold "manual" and if it is needed by XP it will start it, if your not sure use the manual setting then if it is not needed by XP it wont start it.