DSL Modem-》Wifi Router-》Ur PCs
Your hub is useless in this environment. Do you know if your laptops have Wi-fi capability? Assume not, you need two wireless adaptor PC cards (1 for each laptop) and 1 PCI wireless adaptor or 1 USB wireless adaptor for your desktop. Just install those cards/adaptors in your PCs and relevant SW that came with them you should be good to go.