I am trying to connect to my wireless router, which I am sure that it works, because my other wireless devices are successfully connected to it. I also tried to connect to the router using an ethernet cable, however I get a similar problem that the trouble shooter detects. It says: Local area connection doesn't have a valid ip address. The first day I got this Acer Aspire one 722, I was able to connect to my wireless cisco lynkis e1200 router. The only thing I did after that was charge the batter. Then next day I could not connect to a public wifi area and also to my router at home. Is there any other info that you need? Thanks very much for helping me with this.