It's most likely the Anti-Hack.
Disable any unnecessary programs (e.g. via task manager) before you launch FGunZ.
Roei (04-24-2017)
if the things you've been suggested to do didn't work then u can try updating your graphics card, google how to do that [ idk how it is related buuut I've had this problem as well before, I've done that and it just worked normally ]
Roei (04-24-2017)
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