I could never get it to work right with XP, it doesn't matter what version. One of these days I'll figure it out, but since this laptop is W7, all I did was put a BT dongle in, set the phone to discovery and it found it. Set it up, then setup a DUN (Dial Up Network Connection) and that was it.
Been using it everyday in A+ class no problem with cheap Pantech Link (7040) phone, get close to 1MB down anywhere in San Fernando Valley.
I would strongly suggest moving up to W7, its just better especially for stuff like this. No drivers needed for DUN modem via Bluetooth.