Cannot Run CHM File on a 2nd machine

Windows Vista finally forced me to update an old hlp file to chm format. Using Robohelp 5.0, I converted the hpj project to a chm file. If I leave the file in place, all topics and pages display fine. If I move the chm file to another machine, each topic and page displays as "This program cannot display the webpage" (I have IE 7.0 loaded).

It looks like the pages are just links inthe HTM file and of couse, the source is not on the second machine.

Is there a switch I am missing?

Thanks

Doug