http://social.technet.microsoft.com/Forums/en/w7itprogeneral/thread/4e6f46f2-f4c2-40ea-9b54-973f019dcdf5

Here is the solution, I found after long time research.It`s caused by bluetooth software. I had the same "elbauser" corroptud help file. After you do this you`ll have windows original offline help files. If you have bluetooth in your pc, this is pretty much %100 problem causing help files to be corrupted.

1. Click on Start, type regedit.exe in the Search field, and press Enter.
2. Provide consent to User Account Control if prompted.
3. In the left hand navigation pane, expand each registry key until you are at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Assistance\C lient\1.0\Namespaces\OEM\en-US\Topics.
4. Delete the "BCRM_Bluetooth_Help" string value (REG_SZ).
5. Close the Registry Editor and re-launch Windows Help and Support.

 即开始—运行"regedit"，删除注册表中"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Assistance\C lient\1.0\Namespaces\OEM\en-US\Titles"下的 "BCRM_Bluetooth_Help"，简体中文系统对应的为"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Assistance\C lient\1.0\Namespaces\OEM\zh-CN\Titles"