URGENT - v5.0.0 amd64 (stable): Broadcom 4321AG Wi-Fi adapter not detected

["John Wesley Cooper" <jwesleycooper@cox.net>]

Hello,

My name is John Wesley Cooper, and I have recently installed Debian Linux
v5.0.0 on my amd64 processor laptop computer.  Unfortunately, the
installation apparently did not detect my Broadcom 4321AG Wi-Fi adaptor, and
thus I am unable to connect to my 128 bit WEP encrypted wireless network.
Therefore, I need to know where I might find the necessary device driver
hardware, and then how I can set up the system to connect to the my router.
Additionally, my next semester of online courses begins in a week, so I
really need a solution right away!

~John Wesley Cooper