mujhy ek PC (jis me WIFI USB lagi hoee hy OS Win-7 hy) se via LAN Switch Hun k zariye 2-3 PCs me Internet share krna hy, plz help:

1) PC-1 (Win-7) having internet through WIFI USB (idhar se internet share krna hy)

2) Network (LAN, Switch Hun)

3) Other PCs (OS Win XP)

Plz Step by Step Procedure guide krdain k kesay internet ko access kia jasakta hy?