Oops i mis-read you post! I used 3.1 with XP with no probs, until i upraded to 3.5. Im not sure which version is the first with XP support, but it could be 3.1
3.1? It worked for you? Cool. 3.2 onward worked for me, but not 3.1. 3.6 took care of all my authrization problems for sure. And the latest PACE Interlok drivers, of course.
--------------------- 2008 328xi Coupe Sapphire Black/Saddle Brown