I rolled back my machine from Windows 8 to Windows 7 and my wireless adapter has not worked since. I have downloaded the proper driver from this page but in Device Manager there is still the yellow exclamation point error next to BCM43142A0. I have tried connecting directly to the modem via Ethernet and wirelessly and neither one works. I can however access the internet by using my "valet connector" which connects through USB.
Please completely uninstall and reinstall the driver using the uninstall feature on device manager, or the uninstaller from the manufacturer. Then you will need to download Driver Fusion to have it completely wiped. Next you will need to reinstall the device driver to see if this works. Reboot your computer between each step. let us know how this goes.
Thanks for your reply. I uninstalled the driver in Device Manager but every time I did so it kept showing up in Device Manager when I restarted. I installed Driver Fusion as well but I couldn't find it there (pretty much every family I clicked on other than display said "no entries were detected for the selected driver family.") Do I need to buy the full version to access what I am looking for? Anyway, I went in to the Windows DriverStore File Repository and found the file that the .exe I downloaded from the page mentioned in the original post installed and selected that .inf in Device Manager and installed it. This caused my computer not to be able to start up regularly and get a BSOD every time unless I started in Safe Mode (Safe Mode with networking also caused a crash). In Safe Mode, when I opened Device Manager, the driver appeared to be properly installed, though the BCMWL664.SYS file continued to cause a BSOD until I uninstalled the driver in Safe Mode.