T6E and T9E have chips with drivers that are (as of now) no longer updated by their manufacturer. They will require workarounds and all sorts of things. I recommend getting a T4-family adapter...

You have to boot up the computer, then hold shift and click reboot in the start menu. Genius, Microsoft! If you can't use your mouse, you can still navigate the UI with the windows key and arrow keys.

Have your 2.4Ghz and 5Ghz have different SSIDs (Names). Then change the channel in settings.

Does it have CardBus? https://www.ebay.com/itm/PCMCIA-Wireless-Wi-Fi-802-11G-SMC-Card-NEW-98SE-2000-XP-7/290930307036?hash=item43bccc2fdc:g:XtYAAOxyMxpRq4VO:sc:USPSFirstClass!60061!US!-1 This would...

Have you tried out this driver? https://forum.tp-link.com/showthread.php?101991-Archer-T4UH-V1-T4UH-V2-T9UH-Driver-Unofficial-Version-Windows-32-and-64-bit If it doesn't work there is a newer version...

https://sites.google.com/a/vhhscougars.org/johnsearch/searchindex/archer_t4uh_v1_171121 Try out this driver, fixed the issue for some other people