Everything was actually working yesterday but I'm guessing the signal just dropped. The main computer plugged into the modem works.
Yesterday I added a wireless linksys router to me network on a lan to lan connection, so i think that might have something to do with it. Before, it was a lan to wan connection and never had any dropped signals.
I guess I didn't describe my network properly. I have 1 main computer connected to the modem. Two computers wired to a powerline adaptor and one wireless router connected to a powerline adaptor.
Edit
Thanks for your help. I think i figured out the problem. It's my router. I was setting up a lan to lan connection with my router through the powerline connectors and I believe it makes the connection drop. I've had a lan to wan connection with my router up and running for a month with no drops so that must be it. Sucks though because I really wanted my printer on the same network.