Firefox will not connect to any website

I use Firefox to connect to the internet, on a WindowsXP and Windows 7 machine. A day or two ago, both had updates added on shut down. Now, Firefox doesn't work on the Windows 7 machine. Error message looks like: "Unable to connect
Firefox can't establish a connection to the server at www.google.com.
The site could be temporarily unavailable or too busy. Try again in a few
moments.
If you are unable to load any pages, check your computer's network
connection.
If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web."
Internet Explorer works. Added Mozilla to list of allowed sites on the Firewall, still same message. Removed and reloaded Mozilla, still same message. I assume the Microsoft update prevents Mozilla (the old "DOS ain't done till LOTUS won't run" updated to "Windows ain't done till Firefox won't run") from working.

Okay, here is my answer to this problem. At least it fixed my problem and firefox now works fine.
Prior to this problem I was running zonealarm (free firewall) everything worked fine until I removed zonealarm free and installed Comodo free firewall. That is when the trouble started. firefox failed and IE kept working. I tried everything posted here nothing worked for me.
I resorted to "REGEDIT" and removed everything in my registry that regedit would allow that had the name of "zonealarm" on it. Didn't even have to reboot my system, firefox worked first thing. Everything else is fine also.
[note: this is not a slam against Lavasoft's ZoneAlarm firewall. It is just that UNINSTALL programs do not always do a thorough job of removing parts of programs in your systems and registry cleaner programs do not pick them up either.]
USE CARE, "REGEDIT" IS A POWERFUL AND DANGEROUS TOOL TO USE ESPECIALLY IF YOU ARE NOT A SOMEWHAT ADVANCED USER. USE CARE WITH "REGEDIT!"
Good luck.
Lane

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    Okay, here is my answer to this problem. At least it fixed my problem and firefox now works fine.
    Prior to this problem I was running zonealarm (free firewall) everything worked fine until I removed zonealarm free and installed Comodo free firewall. That is when the trouble started. firefox failed and IE kept working. I tried everything posted here nothing worked for me.
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