Telephony Issue w/Vista Home Premium (SP1)

I am trying to install Avaya IP agent on my new HP Pavillion running
Vista 64bit Home Premium & SP1. The operating system software was
preinstalled so there are no XP upgrade issues. Toward the end of the
installation process I receive the following error message "cannot add
TAPI service provider". I have checked the advanced tab in the
phone/modems control panel of my old XP computer and found that the
Avaya IP service provider was installed. Something, however, prevents
the installation of the Avaya IP service provider on Vista. I had not
worked with Vista until purchasing this computer and cannot seem to find
the problem. Can anyone help?


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sushi1413