internet reliability software

hi can anyone point me in the right direction cheers. i have a problem with my xbox 360 disconnectiong from xbox live randomly what i need is some sort of software which i can leave running on my pc which will show if there is an internet fault with my pc as my xbox is pluged into my pc and my pc is plugged into a virginmedia modem 20gb. so when my xbox does get disconnected i can see if my pc lost connection too. that way i can find out if its my xbox or pc. thanks in advance