Yeah If the error is something along the lines of "FrozenInjection" or something like that, then yeah its VERY Common to get that error when playing a diff game aswell as botting.. Usually first time i had HB / HB 2 i was botting & playing on CoD MW2, And It somewhat minimized my game and Bought me an error and i asked about and i can't remember if ski or tony said it was todo with me having another game open.
So simply Either Go play on your PS3 / Xbox360 (Assuming you have one)
Or just Leave it on overnight and play in the day.. Or Just Even so sit there and watch your char grind / quest to 80.(Babysit)
I really hope there will be a fix for this soon.. Cause I woulden't mind doing something else on my PC >_>