Greetings!

Very cool! I don't know what it is, but some device drivers get really tempermental. At least yours behaved sanely - when I plug my CF reader in with the other driver loaded, I get an instant blue screen. That is how I eventually traced it.

Good luck with it. The right combination should be able to get you there. Worst case, you could always just unplug the scanner if you need to use the drive. Crude fix, but effective.