Restore, Terminate & Reinstall HELP & SUPPORT

RESTORE MISSING HELP AND SUPPORT FILES (For Win XP)

1. Click Start, go to Run and type %windir%\INF

2. Locate the file pchealth.inf, right-click and select Install

• There will be two files namely PCHealth.INF and PCHealth.PNF. Right-click on the INF file (identified by a text pad and Gear icon in it) and choose Install. Note that the .INF suffix is not shown in Windows Explorer unless the Hide extensions for known file types setting is disabled in Control Panel / Folder Options / View tab (this how to do it)

3. Next, you'll be asked for the Windows XP CD (to extract dataspec.xml and many other files). Insert Windows XP CD and point to the i386 folder in the CD. The i386 folder is usually located at the root of the drive for retail Windows XP CD. (DriveLetter:\I386)

4. Click OK. This restores missing Help and Support files.

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END THE HELP AND SUPPORT SERVICES

Click Start, point to Run, type Taskmgr and click OK. This opens Task Manager. Click the Process tab. Terminate the following processes if running:

• helpsvc.exe
• helphost.exe
• helpctr.exe

It's either by right-click end process or directly click the button.

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REINSTALL HELP & SUPPORT

Click Start, go to Run and type cmd.exe. Click OK.

In Command Prompt, type the following commands one by one and press {ENTER} after each line. 

Alternately, you can copy the commands below to Notepad, save the file with .bat extension (e.g. helpfix.bat) and run it. Then RESTART your computer.

net stop helpsvc
cd /d %windir%\pchealth\helpctr\binaries
start /w helpsvc /svchost netsvcs /regserver /install
start /w helpsvc /register
start /w helpctr /regserver

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Alalalalalala~~ this is only for Windows XP. I don't think the latest windows has problem with help and support.

p/s : thanks to the generous commenter who gave this helping method. And this is the original site.