I used to have a network direct from one computer to the other via ethernet cable. However, recently we had broadband installed and now my network goes through an Aztech router. However, although I can view both computers on both of the computers, and although pinging both computers works, for some reason every time I try to transfer more than about 1mb the network goes off, as does my router, and internet connection and the transfer fails. I am not particularly into all the tech computer terms, so please keep answers as simple as is humanly possible.