well if you don't need to use your broadcom card then click start and right click my computer and go to properties. From there click on the Hardware tabs , and click device Manager. Expand network adapters and right click the broadcom one and click disable. IF that doesnt work you might just try going into the control panel and going to network connections, then see if it says wireless connection 2, then right click it and choose view available wireless networks and go from there
hope this helps