WiFi is SUPER slow on 1 of 3 PCs

Hello everyone I've got a tough one..

Custom PC with Nighthawk R8000 router. EnGenius wireless adapter.

Here's the deal. Speed test only gets to around 2Mbps on my custom PC but when I plug it into my wife's custom using the same network adapter it goes up to 150+ Mbps. Obviously, something is up with my PC. Just did a factory reset last month. Just ran the network CMD lines with no luck, I haven't the faintest what could be going wrong, please help.

have updated firmware
have updated drivers
have removed firewalls
 
Win/10 WiFi issues have frequently been solved by getting the latest driver from the Chip maker's website - - NOT using windows update BTW.
 
I had a similar problem. I had to change the encryption method on the router from wpa2+aes to wpa+tkip. I was able to get higher speeds but it also means lower security for everyone on the network. Im guessing certain usb ports dont handle the encryption well? Im not sure why but it worked for me.
 
Yea since it works fine on another PC that is using the same router then I would agree on it being the drivers. I would just make sure the router is configured correctly just to make sure.
 
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