Solved! Right click 'my computer' select properties. Then I went to device manager and went into the properties of the USB, then clicked the advanced tab and selected wireless mode. I then changed it...

My Archer T2U is not showing any 5ghz networks, when I got into the advanced properties VHT 2.4G IOT shows however the 5.0g option isn't there. It's also not picking up that it's connect to a USB3.0...