Firefox can access the Internet, but IE and all my software updates are unable to find the server

I cannot udate my software or use IE. I receive an unable to find server message when I try, but with Firefox there are no problems when I access the Internet, and I can go anywhere.  This started about 1 week ago.  Nothing notable happened.  My updates are automatic, and I am very careful about the sites I go to.  Suddenly I could not update anything.  Then I found only Firefox could access the Internet.  I reset everything I could.  I reloaded IE and even tried to download another IE version.No luck and it is very frustrating. Help please.
SnoozegirlAsked:
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SnoozegirlConnect With a Mentor Author Commented:
To fix this problem I finally broke down and bought a copy of Vista Ultimate.  Since I had some downtime I also bought a state of the art graphics board and a new quad motherboard plus dual Raptors and a 400G additional HD.  Reformatting the hardrive was a lot of work, but since nothing else worked, it was the only answer.
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war1Commented:
Hello Snoozegirl,

1. Clear your DNS cache.  Go to Start > Run and type CMD
and hit OK.
At the command prompt, type ipconfig /flushDNS
and hit OK.

2. Clear your cache.  Go to Tools > Internet Options > General tab.  Under Temporary Internet Files, click "Delete Files" button. Also click "Delete Cookies" button. Click OK.

3. Reset the Maximum Transmission Unit in the registry
http://www.pctools.com/guides/registry/detail/280/

4. If no joy, check if your PC is blocking the site.  Do a search for HOSTS file and open it with an editor like Notepad. Delete any line that has the blocked site in it.

HOSTS file is located in
Windows XP      =      C:\WINDOWS\SYSTEM32\DRIVERS\ETC
Windows 2K     =     C:\WINNT\SYSTEM32\DRIVERS\ETC
Win 98/ME     =     C:\WINDOWS

It is a hidden file. Go to any folder and select Tools > Folders Options > View. Check "Show hidden files and folders". Click OK.

5. Run this script to fix your connection. The script reinstall winsock, TCP/IP stack, and HOSTS file.
http://downloads.subratam.org/WinsockFix.zip

6. Check if antispyware, antivirus, or firewall is blocking the website. Disable these programs one by one.

Hope this helps!
war1
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SnoozegirlAuthor Commented:
Tried this multiple times and no luck.  Still cannot access the internet.
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SnoozegirlAuthor Commented:
This did not help and I still cannot access the internet using Internet Explorer.  I can access it using Firefox.  I cannot update most of my software.  I did however receive an update to my Windows OS from Microsoft.  I am running Windows XP Pro and have tried reloading the browser IE, turning off the virus protection (I use CA), I will be happy to answer any questions regarding this matter.  
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war1Commented:
Did you check your firewall?  Does your firewall all IE?

CA antivirus still could be at fautl. Uninstall CA.
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SnoozegirlAuthor Commented:
I did uninstall the Ca virus checker, but I don't use the CA firewall.  I use the windows firewall that comes with the OS. It did not help and I just uninstalled it again, but still no luck. I have even tried restoring my computer to an earlier time but this did not work either.  Most of the simple stuff I have tried without success.
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