A lot of times you can't use the wireless card unless you install their drivers with their wireless utility (I'm looking at you Belkin). If the wireless card driver is listed as correctly installed in the Device Manager then you'll probably be ok without the manufacturer's utility. To use Windows' wireless utility, right-click My Network Places -> Properties (or Control Panel -> Network Connections). Right-click the wireless network and go to Properties. Dig around the Wireless tab you'll find an option to let Windows manage the wireless connection.