IrDa adapter only works in Vista ultimate not in the business version

> Hello,
>
> I use Windows Vista Business und Ultimate on two computers. (both 64 bit).
> Now I bought a new Polar Irda USB 2.0 adapter.
> Installing this device on Vista Ultimate is no problem . The correct drivers
> are installed without any problem. But when I try to install it on the
> business version i won´t work. Vista doesn´t find the correct driver!
> I tried to copy the driver from the Ultimate to the Business Version! But no
> chance!
>
> The device Manager shows up two drivers installed:
> irenum.sys
> stusb2ir.sys
> The Chipset ist a Sigmatel STIr42xx!
>
> What can I do, that my business Version of Windows finds the correct driver?
>
>
> Thanks in advance!
>
> jhwaxx
>
>