Problem in my Ad-hoc network

Hi friends

I have a " D-LINK Airplus G132" USB Wi-fi
and use it in my PC. . . on the other side I have Laptop with intel wi-fi. .i make a SSID in my pc with Software of D-link and on other side Connect to this with internet sharing

My DHCP in my pc is Automatic obtain.
In first time my laptop connected to pc with internet BUT when Reset, or shut down or Close connection and .............. LAptop connected but no have internet

I check my TCP/IP in my PC and see A new IP Configed in DHCP
It's wonderful for me. .because in past time everything is OK.
I dont have More Knowledge about Wi-Fi network. .I change OS [WIN] and try again but problem still Alive!!