If your computer has an embedded Bluetooth wireless adapter, verify that Bluetooth is turned on. If you have a plug-in USB Bluetooth wireless adapter, verify that it is plugged into your computer, before you start the download. Start the download.
WiFi Sharing Manager - Share WiFi to your second computer which lacks wireless adapter card. It turns any WLAN-connected laptop into a LAN router (or called "Gateway"). And your second computer which lacks wireless adapter can connect by its sharing.
CommView for WiFi is a powerful wireless network monitor and analyzer for 802.11 a/b/g networks. With CommView you can see the list of network connections and vital IP statistics and examine individual packets.