the program just crashes on my win7 + sapphire HD7950 with 13.12 Catalyst + sgminer 4.1.0
That's odd. Did you run it by just clicking the exe or did you run it from the command prompt? You need to do the latter. Do you get an error message?
PS. What video card or drivers you run are not relevant since HashPeak only communicates with the miner through the API.
Cheers,
Fletch