Carefully follow the I-Bus interface installation drivers in this link. The first time I tried to setup the drivers for Resler's USB I-Bus interface, I screwed it up. It is very easy, you just need to follow the steps.

http://www.reslers.de/IBUS/drivers.html

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input