@geronimo 

What are you trying to accomplish and how exactly are you using the Archer T9E?  Are you connecting both your TV and Computer to a router or are you trying to do an Ad-Hoc connection between the two Devices?

@geronimo 

I custom built my pc, and the Gigabyte motherboard didn't have wifi. I added the Archer T9E so I could wirelessly view movies, photographs,etc on my big screen tv. I didnt want to drill a hole in the wall for HDMI access. As I stated before, the wireless linked flawlessly, until recently. What I'm trying to accomplish, is to restore the wireless link. My tv and computer are both registered on my modem network

@geronimo 

Microsoft decided to eliminate Miracast from Windows 10, version 2004. My Archer T9E depended on Miracast as a wireless conduit to my TV. Miracast has been superseeded in Windopws 10, version 2004, by the app " Wireless Display", which can be installed as an optional application. 

@geronimo  The Archer T9E needs an updated driver for Windows 10 version 2004, that will reestablish the adapter's ability to link with smart tv's. My laptop, that has native wifi, casts to my tv flawlessly.