Well this is an intresting tip while moving from XP to Vista. When we launch the Help file in Vista, Help file (.hlp) may give you the following types of errors.
You can download this patch from following link.
winhelp.reg
containing:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WinHelp] "AllowProgrammaticMacros"=dword:00000001 "AllowIntranetAccess"=dword:00000001
Now it's done! Your Help in Vista is working as good as Help in XP once did!