Try this:
http://www.amazon.co.uk/TP-LINK-PA411KIT-Powerline-Adapter-Starter/dp/B0084Y9N3O/ref=sr_1_1?ie=UTF8&qid=1435849740&sr=8-1&keywords=tp+link
I use it since my room is built from where we extended the house and obviously the outside walls are thicker cos of insulation so my wireless is shit. Just plug these in to ur mains and put an ethernet cable and ur sorted
Or before I had this I used these which was the only thing that would pick up wi-fi in my room
http://www.amazon.co.uk/TP-LINK-TL-WN822N-300MBPS-Wireless-Adapter/dp/B00416Q5KI/ref=sr_1_9?ie=UTF8&qid=1435849740&sr=8-9&keywords=tp+link