We have noticed that on some SBS 2003 installs the “Help and Support” service will disappear after installing Windows 2003 Service Pack 2. You may see the following error when opening "Help and Support" from the start menu:

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Help and Support Error
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Windows cannot open Help and Support because a system service is not running.

To fix this problem, start the service named 'Help and Support'.
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OK
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This issue is currently under investigation, however if you are currently experiencing this issue you can run the following commands to resolve the issue:

1. Open a command prompt.
2. Navigate to %windir%\PCHealth\HelpCtr\Binaries
3. Run this command:

start /w helpsvc /svchost netsvcs /regserver /install
4. Once this command completes the Help and Support service should now appear in services.msc
5. Start the Help and Support service

ok