I recently got a 3g modem. The internet is now working across all computers in my house except the main one. The problem is that I cannot find the wireless network connection button on the computer? When you click connect to all my old ways of connected to the internet come up but the "wireless network connection" does not come up as it does in all of the rest of the computers. This means that the computer cannot connect wirelessly to the net. Why is this and more importantly how can one fix it?