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Computer connected via ethernet;working fine til Mozilla upgrade, now can't find connection

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I have Westell Modem connected to WAN router, to create wireless connections for our laptops. I use Ethernet cable to connect router to HP Computer (Windows XP). It was working fine yesterday. I believe Firefox downloaded an update to my computer yesterday. Now, I can't connect to internet. I checked all wires and plugs, but error msg says WAN is disconnected, and I get error msg 404 why try to open Firefox.

I have Westell Modem connected to WAN router, to create wireless connections for our laptops. I use Ethernet cable to connect router to HP Computer (Windows XP). It was working fine yesterday. I believe Firefox downloaded an update to my computer yesterday. Now, I can't connect to internet. I checked all wires and plugs, but error msg says WAN is disconnected, and I get error msg 404 why try to open Firefox.