I've seen this plenty of times before. It's a driver issue. Unfortunately, it doesn't look like intel provided a driver past win 8.1. I've seen Windows 10 run on a lunch box with no problems, but it looks like you lucked out. Also, remember that using wireless never actually guarantees you maximum rated speed. There are way too many factors that can impede performance. My suggestion is to return this adapter to where you bought it and pick up an AC wireless card that is Windows 10 ready.