Here is what happened: I have a DELL XPS all in one computer. I reinstalled my operating system (windows vista) and wiped my computer clean. Before I did this my wireless broadcom adapter was working. I have reinstalled all the drivers including trying to install the broadcom network adapter. I've gone to dells website and put in my tag and it pulls up drivers I need, which I installed. I've checked under device manager and the only driver with a yellow triangle "!" is the broadcom 802.11n networkd adapter. I've tried updating, but am told I have the latest software, and when I troubleshoot the problem it tells me "this device cannot start (code 10)" When I tried to install the driver and got to extracting the networkd adapter it doesn't "run" any type of setup.exe - it just opens a folder with files, but without any .exe file. I had this problem when I first bought the computer and wiped it, but it was under warranty so Dell remotely took over my computer and fixed it, but that was many years ago and I don't know remember what they did.
I've tried installing the broadcom network adapter driver from the disk that came with it, and from the internet (i'm currently plugged into my modem).
I'm fairly computer friendly, but this is a problem I have yet to be able to figure out.