not showing in add/remove multiple occurences

Hi... something seems to be wrong with the add/remove programs. At first I
thought it was that the software I had installed didnt come with an
uninstaller. But its happened with 3 or 4 things now. I contacted some of
the support people for the products that werent showing and they assured me
that the product came with an uninstaller. They recommended I reinstall the
product, but it still didnt show. I recently started using a utility called
"easy uninstall" to do the add/removes, but would like to know whats up with
the add/remove and fix it if possible.
thanks in advance!