Computer keeps closing the online game

I've bought and played this game many times before, but now I just want to play online for a bit. But my computer keeps shutting it down when the online game starts. I don't know why. The DEP computer program says it's "protecting" my computer from viruses. I tried to add bfgclient to the list of programs to allow but it doesn't work.

Anyone else have trouble with the online game running or the computer shutting it down due to this DEP thing of Vista (Data Execution Protection)?