My computer's internet speed just dropped overnight. I know it's the computer because other computers in the house are fine it's just my pc. I did everything I could think of, ran multiple anti-virus scans (Norton), I would reset the whole computer if I could but apparently windows 8.1 doesn't let you do that. I also use an Ethernet cable not a wireless connection and when the Ethernet cable is unplugged, it can't connect when it normally should be able to, it's like my computer is purposely trying to shut out the internet. I don't know what to do, please help me.