So basically i have my ISP's modem which has wifi , but in my room which is in the other part of the house i need another wifi because the other is weak so i bought a "TP-LINK TL-WR840N 300mbps wireless n router". Got one more pc in the house and that is connected directly in to the ISP's modem and it gets full bandwith which is around 60mbps on speedtest which i am paying for. I also get full speed when connecting directly from the modem, if i connect the ethernet cable from the ISP's modem to the routers wan port i just mentioned and then from the router to my pc i only get around 8-9mbps. Suddenly the speed was going up to 60 which is supposed to be. So i tought its all okay. Played a few games and after 2 hours i checked again the speed and it was back to 8-9mbps. Cables are all fine,tested on the other pc,they are cat5e. It is either windows or the router. Also as soon as i setup the quick installation guide i cannot acces the routers page, which is tplinkwifi.net or 192.168.1.1, but i can enter 192.168.0.1 from the isp