Hi,
To reinstall help and support
Copy and paste the following lines in a Start > Run prompt:
rundll32.exe advpack.dll,LaunchINFSection
%systemroot%\inf\pchealth.inf
The routine will ask for the Windows XP CD, alternatively, try to
point it to the System32\dllcache folder and the
ServicePackFiles\i386 folder.
Or
To reinstall Help and Support:
http://www.kellys-korner-xp.com/top10faqs.htm
You can also check this:
Go to Kelly's site:
http://www.kellys-korner-xp.com/xp_tweaks.htm
and scroll down to line 235, left column
Good luck, hope this helps