This happened to me a week ago when I just came back from a 6 day 5 night camping trip. I switched on my 3gb ram windows vista hp laptop, which I had turned off and left at home since the trip, and found that all my browsers couldn't work except internet explorer(version 7). I usually use firefox but it says "Failed to Connect". I thought it was just a problem with firefox so I downloaded Google Chrome(through IE) but it also displayed "This webpage is not available."

Even playing online games do not work. I tried Combat Arms, America's Army and Soldier Front but a box pops up claiming that they can't connect to the server. Offline games work fine though.

I scanned for viruses using both AVG and Windows defender but nothing was detected.

Can someone please help me because I really want my firefox back.

and please no one sentence answers because I need real help not "restart your computer" or something because I tried everything, including reinstalling firefox.