Right so about a week ago my internet started slowing down like a bitch. Usually from my computer I would get about 20+Mb/s download speed and around 10ish upload speed according to speedtest.net. Now, well, im not. This is a speedtest I just took.

Right so I just need some help trying to figure out what the problem is. I have already done a bit of searching around for a solution, and im still stumped. I've done a speedtest on ALL my other devices (Two other laptops, 3 iphones) and they all get around 20Mb/s download speed. So its not my internet. I've scanned my computer for viruses, I'm clean. I've tried different browsers, and I get the same results.
Im tempted to go to the store and buy a new USB Internet Adapter, because perhaps mine has gone to stuff. But before I do that, is there anything else I can try to do to fix this?