Security patches for Windows lead to the following problem: HostMonitor cannot display help when running as Win32 service.
http://support.microsoft.com/kb/896358
Solution - you should add 2 DWORD variables into registry under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions
1) EnableFrameNavigationInSafeMode = 1
2) EnableNonInteractiveUser = 1
and restart service
If you do not have HHRestrictions key in the registry, you may create it.
Regards
Alex