Originally Posted by
blueandblack
Keep the modem plugged in where it is and try the computer at the new location (assuming you have configured and turned on the wireless facility in the modem and have a wireless network facility in the actual computer). See what happens. Sometimes it works, sometimes not depending on the site.
Another option is to get a Wireless Access Point, which is a device that connects to the modem, but allows access wirelessly to other devices.
Final option is to measure the linear distance between modem and computer and buy a cable long enough to link them, so long as the distance is < 100 metres.