hello again, the problem was in my end, in another pc everything went fine, so thank you for your help and your time.
but i have one question, what "gpu memory using" does? i changed it from 32 (default) to 256, 512 and 1024 (my card is 1gb) and i didnt see any changes at all in gpu usage or anything else, i (and maybe more) would appreciate it if you knew, thanks again.