When I click on help and support (in the start menu or in control panel), the computer thinks for a second and then doesn't do anything. Does it need to somehow be re-installed?
Go to C:\Windows\inf\pchealth.inf.
Right-click and choose install. Have your XP CD available.
Note: The folder is hidden by default. Go to Start > Run and type in:
control folders. View: Show hidden files and folders and uncheck
"Hide extensions for known file types".