I install the lastest driver for realtek rtl8811au wireless lan 802.11ac usb 2.0 network adapter, do i need to get another network adapter to solve it?

I bought and iBUYPOWER pc (BB902) , and when test my internet speed and i get 40 mb, when my internet connection in all my other devices is 100 mb and the modem is really close to my PC
I use this...

You think they might come up with and updated driver that make it work for Win 10?
or should i get different netowrk adapater

On my older PC i was getting the full 100 mb and it was on the same place where my new one is right now, i dont get what your saying i think is something wrong with the pc or i need to upgrade a part.

I bought and iBUYPOWER pc (BB902) , and when test my internet speed and i get 40 mb, when my internet connection in all my other devices is 100 mb and the modem is really close to my PC
I use this...