I was able to discover why my desktop was not installing. Apparently the Install Shield is an old version. I followed solutions I had found on Google to no avail. What finally DID work was to install Acrobat Reader for Palm OS in safe mode for Windows XP. I believe that Service Pack 3 of Windows was inhibiting the install.
I don't know how risky this is to do, but it worked. Something like this may also work for Vista. I don't know.