I came back to the computer after several hours of leaving it on and was met with act notifications saying infections detected - Trojans. Nobidea how they got on there as there were no programs I had left running. I ran avg and malwarebytes which removed some Trojans and shell.exe mostly from the app data Microsoft folder. Now I can't connect to the net. Firefox says the proxy server is refusing connections. No idea what this means as I've never used a proxy with FF yet. IE won't load pages either, however utorrent will work and the connection to the router is fine. Help?