SB Multiplayer problem

I downloaded the newest Squawkbox from simvol. I logged on to VATSIM and parked at KORD. I set the multiplayer level to 5 miles and when the first aircraft loads, the program and computer freeze. I have to reboot the computer. When I fly with multiplayer at none, all works fine, except no voice but I can't see other aircraft which makes being at busy airports impossible. I use Fly 2 off a USB 2G drive since I use several computers. The main one now is an HP laptop.Any thoughts about what I may be doing wrong or have set up incorrectly?Tom PetersonFargo, ND