Connection through proxy lost after updating to 10.5.5

Here the connection to Internet is done through a computer running Windows XPSP2 due to hardware restrictions (no compatible with Mac). This computer is networked through Airport and has all sharings activated. Until two days ago the system worked fine, on Mac the setup is Manually, Automatic proxy configuration. All computer have manual TC/IP configuration and the LAN is working without a flaw even now.
The problem is that with no modification in any setup the Mac cannot connect to Internet, Network Diagnostics gives red on Internet and Server, all after updating from 10.5.4 to 10.5.5
But the server that is connected to Airport through ethernet cable has no problem.

Well, thanks to all who have read it though did not have ideas on how to solve it.
The issue was:
On Router for the TCP/IP configuration I put the address of the computer connected to Internet, But also on the Prosies tab I entered Manually and Automatic.
So there was a conflict and the macs could not find how to go out.
I have disable the Proxy configuration and everything is working fine now.

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ASUSTeK Computer INC. 1005HA
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QuickTime 7.6.6
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Apple Application Support 1.2.1
iPod Updater Library 9.0d11
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 3.0.0.102
Apple Mobile Device Driver 1.46.0.0
Bonjour 2.0.0.34 (214.3)
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Video Display Information
Mobile Intel(R) 945 Express Chipset Family
Mobile Intel(R) 945 Express Chipset Family
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No external plug-ins installed.
** Network Connectivity Tests **
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Connected: Yes
Online: Yes
Using Modem: No
Using LAN: Yes
Using Proxy: No
SSL 3.0 Support: Enabled
TLS 1.0 Support: Enabled
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Connection attempt to iTunes Store was successful.
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iTunesHelper 9.1.0.79 is currently running.
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iPhone 3G running firmware version 3.0
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Message was edited by: gobblygook
Message was edited by: gobblygook

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Connection through proxy lost after updating to 10.5.5

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