Share internet mobile to pc

Hello,
I hv nokia n78 set.i hv package internet through gprs conection from Zonginternet. zong is my region mobile comunication service in pakistan.i hv pc p4.1GB ram, an 2.6 procesos.instald os microsoft windows service pack2.my quest is i want share internet frm my mobile to pc via data cable.hw cn i cönect n share both by using internet in both of them.