|I suspect your choice of software is lying to you.|
Your laptop has Realtek wired ethernet, and one of three different possible wireless network adapters (Atheros, Foxconn, or Ralink) according to Acer themselves.
I've never actually "met" a Broadcom wifi card...tons of wired ones though. It's possible Broadcom and one of the above brands work together in a "brand engineering" scheme, so you might really have a Broadcom card sold under a different brand, but let's go with what Acer says first and foremost unless you've had the card replaced with a different one.
Download and run Unknown Devices (http://www.halfdone.com/Development/UnknownDevices/). It might identify your card, at least brand name hopefully.