Vista - lost network suddenly

So, all of a sudden, my devices can't see each other. It was all working fine until yesterday. Here's what has changed since I last used my network: I installed a game called Magic Online and I had to reset my router to factory defaults. I can't figure this one out. I don't know what other info I can provide. It just happened suddenly.

Strange, but not much info to go on. I would certainly try first a system restore to before the problem started and then we will go from there. Let me know it this helps? Step 2 I would check channels on router and then network card.

Thanks for the reply. I should have mentioned that I tried a system restore, but that did not work. I also just upgraded my router's firmware about an hour ago, but that did not produce any results. But here is an update: on the "View Full Map" page, my computer lists the xbox360 as a device, and it also sees the downstairs computer. Neither my 360 nor my ps3 are seeing the computers.