Motorola SM56 Speakerphone modem on Vista

Hello,

I am trying to install the drivers available from motorola that are
supposed to be vista compatible as said by the motorola support
site.But when i install the modem using the newest drivers,the modem
isnt installed correctly and the error code 10 comes (device could not
start).

When i install the drivers that were ment to be for win xp,the modem
gets installed correctly,but the modem query command in the modem
diagnostic tab of the driver's property says that the interrupt for
the port should be checked for correctness..

see this:

http://img169.imageshack.us/img169/9762/capturebr4.jpg

But i dont know how to check interrupt for the port on which the
modem is installed..

Can anyone help me out of this situation?

Thanks.

Regards.