what am i doing wrong?

I have cgminer-3.7.2-windows

i have downloaded AMD_APP_SDK

I can only get one worker to work at any one time. I tried adding this line to the bat file but doesnt work. please help me...

-I 20 -g 1 -w 256 -thread-concurrency 32765 -gpu-engine 920 -gpu-memclock 1500