You cannot use realtek and play in a punkbuster server. It is punkbuster conflicting with realtek and that causes the lock up. If you use speakers and a headset you should buy a soundcard, if you use just a headset you could get a usb adapter or usb headset.
As for your crash to desktop, it is another issue with eyefinity and surround for BC2. You have to run the game settings in this order - Low-Low -HIGH - HIGH. The first 2 have to be at low to avoid crashing.
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