"Help and Support" feature is missing or cannot open Help and support service files that require the Windows Help (WinHlp32.exe) program
http://support.microsoft.com/kb/937231
At a command prompt, type the following commands, and then press ENTER after each command:
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%windir%\pchealth\helpctr\binaries\HelpSvc.exe /regserver /svchost netsvcs /RAInstall
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%windir%\pchealth\helpctr\binaries\HSCUpd.exe -i %windir%\pchealth\helpctr\binaries\hscmui.cab
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%windir%\pchealth\helpctr\binaries\HSCUpd.exe -i %windir%\pchealth\helpctr\binaries\hscsp_l3.cab