Internet Explorer Downloading Error

I have several systems (Windows XP SP2) where Internet Explorer (6.00.2900.2180) stops functioning. IE will attempt to open a website, but gets the message "Internet Explorer cannot download ..al%2fsso%2fSSOLogin%2easpx%3f from smusath.net.bms.com. Internet Explorer was unable to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later."

It does not matter what the site is. Firefox is able to connect to the same sites with no problem from the same PC. The only common thread I can find among the systems is an install of Webex, with the file atcliun.exe on the system. Since IE is needed for access to local intranet sites, just using Firefox is not an option. I have extensive information on a system available from SIW.

I have run HijackThis on the system looking for malware. Nothing noted.
I ran a full virus scan. Nothing.
I ran Rootkit Revealer. Nothing
I ran an AD Scan. Nothing.
I tried a solution from the Elder Geek to re-install IE. Made the system unstable and worse.

Any ideas would be appreciated.
shroutgAsked:
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Marc ZCommented:
So if I read you correctly,  ANY page you try to go to in IE throws that error, correct?

"Internet Explorer cannot download ..al%2fsso%2fSSOLogin%2easpx%3f from smusath.net.bms.com. Internet Explorer was unable to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later."

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shroutgAuthor Commented:
Correct. Any webpage we try to open, either on the Internet or on our Intranet, does not work. Same webpages can be opened with Firefox, but that is not a solution.
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Marc ZCommented:
And smusath.net.bms.com is you or not? Do you know this "al%2fsso%2fSSOLogin%2easpx%3f from smusath.net.bms.com."

Have you tried resetting IE to all defaults? Lowered security?

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shroutgAuthor Commented:
smusath.net.bms.com is our internal site. Other systems can't get Google or any other page they have set as the default Home page. We have an image of the system and are restoring it to a test box. We will try setting IE to the default security level.
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Marc ZCommented:
So it sounds like somehow your Proxy got mucked up.

Compare your Connection settings in IE to what you have listed under Firefox.  Are they different?  Try changing IE's connections and restarting IE.
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shroutgAuthor Commented:
Thanks to all who have responded. All the suggestions have been tried and nothing works. Our only fix for this has been to re-image the system. Once again, the only common thread to the affected systems is an installation of Webex at sometime. Some systems have an active installation, others had been installed and removed.
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Computer101Commented:
PAQed with points refunded (500)

Computer101
EE Admin
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