This happened to me when I tried to open the help that is associated with the IIS 6 Diagnostic Tool WFetch 1.4.
I headed on over to Microsoft's KB 917607 page and low and behold here is what I found:
... the Windows Help program has not had a major update for many releases and no longer meets Microsoft standards. Therefore, starting with the Microsoft Windows Vista and the Microsoft Windows Server Code Name "Longhorn" operating system releases, the Windows Help program will not ship as a component of Windows. Also, third-party programs that include .hlp files are prohibited from redistributing the Windows Help program together with their products. Users who want to view 32-bit .hlp files must download the program from the Microsoft Download Center, and then install it on their computers. The download for Windows Help is still in development and will be available in early 2007 [Emphasis mine].
Wow, kinda leaves a whole lot of us in a bit of a pickle eh? Have a program coded with the old Windows Help setup you need to access while installed on Vista?
Not going to happen!
The pain of it though, the program WFetch 1.4 is BY Microsoft! :*P
Oh well, I guess it is another little thing that will hopefully be made right at some point as per the KB article!
And, maybe another reason for some to not install Vista at this point.
Microsoft Small Business Specialists