BG - I think you have got it now from post 44. Find the make of the new wi-fi network device. Find their website and download the windows 10 driver for the device. Install that driver on the computer. Don't google 802xx as that will just tell you all about wi-fi standards. Once you have...
OK my 2p worth. You said "inserted a 802.11nUSB Wireless Lan Card" Inserted meaning ? Plugging it in to an external USB port on the laptop? or actually opening up the case and inserting it (unlikely)?
Step 1. Remove the new wireless Lan card. Step 2. Reboot laptop. Step 3. Uninstall anything...