problems with connecting wifi and lan

i have an odd dilemma here.. my friend and i live in a dorm together and want a homegroup via Ethernet plugged into his router. but the the router is not plugged into the wall because if we plug it in it turns the internet off and we cant use it for an hour. so i have a wifi card and so does he and we want to be able to have this homegroup so we can print and share files etc. but if i we are plugged in the wifi says its connected but does not work. suggestions? thanks:p

This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.