I downloaded version 3.6.15 to my #2 laptop via wireless. Now I can't acess the internet via any browser. "Invalid request - You requested a page that does not exist." My desktop and #1 laptop are OK. The Firefox Help article, "No programs can load websites," states, "your problem is external to Firefox and you should seek support elsewhere." Well, I've run down all those tips, but no help. I'm running Avast antivirus, and my Windows firewall is configured to allow Firefox. My wireless connection is good. I've rebooted, cleared dns cache, trashed all my cookies. What next? Thanks!