We already had a conversation about this but I thought I would post here for the benefit of others.
I had a tech support call yesterday from a new user with the 3423 automotive unit. He was having problems with the driver installation step using a Comp USA 2.0 pcmcia cardbus in an older laptop. He had installed the software and then plugged in the hardware with no other programs running, just as you should, so Windows XP could do the find new hardware thing and install the drivers.
When he got to the XP message about unsigned drivers and said continue anyway the PC just locked up. The solution was really quite simple. We did the driver install step on the built in 1.1 port with the pcmcia card removed. He was then able to install the card and go with that.
He was glad he had purchased from Autonerdz so he could get up and running with a phone call and minimal hassle.
I don't know if other card PC combos would have the same issue. This is the only such configuration I have dealt with. But now I have a little ammunition for the next similar issue. Feel free to call if you need help setting up one of these. I welcome the challenge