Error Running Windows Update

[RiCo]

today I tried to update windows (XP home)

All i get is this page and message
http://v4.windowsupdate.microsoft.com/en/thanks.asp

Thank you for your interest in Windows Update

Windows Update is the online extension of Windows that
helps you get the most out of your computer.

You must be running a Microsoft Windows operating system
in order to use Windows Update.


Ive searched for any critical hotfixes I need, but to no
avail

Im already running
XP Home Edition , version 5.1 (Build 2600 xpsp2.030422-
1633 -Service Pack 1)

Internet Explorer 6
Version 6 : 6.0.2800.1106.xpsp2.030422-1633
Cipher Strength - 128-bit
Update Versions -:SP1; Q813489;Q330994;Q818529

Ive already applied fixes Q823559
http://www.microsoft.com/downloads/details.aspx?
FamilyID=11cdd153-65ec-4851-886c-
5a412438d6d4&DisplayLang=en

I have tried with

Problem Description:
When going to the Windows Update Web site located at
http://windowsupdate.microsoft.com, the page immediately redirects you
to
http://v4.windowsupdate.microsoft.com/en/thanks.asp, which says "you
must be running a
Microsoft Windows operating system in order to use Windows Update."
This occurs if both a third party firewall and the built-in Windows XP
firewall are enabled at the same time.


Resolutions:
Please delete the following registry key. Be sure to export this key
to a safe location first.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet
Settings\User Agent\Post Platform
--------------------------------------------------------------------------------
This may be resolved by uninstalling the third party firewall.
--------------------------------------------------------------------------------
The system administrator may have made changes to your corporate
firewall/proxy that will not allow Windows Update to operate properly.
Please contact your system administrator and have them identify
Windows Update as an excluded site on the firewall/proxy.
--------------------------------------------------------------------------------

Issue Applies To:
Windows 2000
Windows XP

It works with my firewall disabled ONLY, but i never had to Disable my
firewall previously, so why do I need to now ?

Someone Please help, this is driving me crazy

 

[PA Bear]

May we assume you've read the section about the error at
http://v4.windowsupdate.microsoft.com/troubleshoot/?

Anti-virus, pop-up/ad blocker may be interfering, too. Are you running a
third-party firewall as well as WinXP's built-in one?
--
HTH...Please post back to this thread

~Robear Dyer (aka PA Bear)
MS MVP-Windows (IE/OE)
http://mvp.support.microsoft.com