Help and Support Service is Missing

If the Help and Support service is ever missing from the service snap-in, there are two things that can be tried to fix it.

1. Download the helpsvc.zip from here: http://windowsxp.mvps.org/reg/helpsvc.zip. Extract the file and double-click it. Answer yes and reboot.
2. Go to %systemroot%\inf and locate the file named pchealth.inf. Right-click on this file and choose Install. This will force a reinstall of the entire Windows Help and Support system. Reboot.