What is the mapping software installed in your iPAQ312 that you are referring to?
I do not have a iPAQ312 PDA but if it was a genuine HP update file that did not install correctly I would contact HP support via email with the exact sequence of events and the error message now being displayed... or you might find some info in HP supports troubleshooter section...
There are some links to other sites with iPAQ312 info in this old thread.
"The female A S S is a mysterious creature." Sir David Attenborough