Try this...found in the microsoft windows update
trobleshooting page
http://v4.windowsupdate.microsoft.com/troubleshoot/
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Problem Description:
When you attempt to use the Windows Update site, you may
receive an error
message similar to the following:
Administrators Only (-2146828218) To install items
from Windows Update, you
must be logged on as an administrator or a member of
the Administrators
group. If your computer is connected to a network,
network policy settings
may also prevent you from completing this procedure.
You receive this message even though you are already
logged on as an
administrator or a member of the Administrators group.
Resolutions:
This issue indicates a problem accessing a resource and
may not indicate a lack of administrative privileges.
One of the resolutions below may help.
To resolve this issue, follow these steps:
1. Click "Start," and then click "Run."
2. In the Open box, type regedit and then click "OK."
3. Locate and select the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersi
on\WindowsUpdate
4. click "Edit," and then click "Permissions."
5. Click "Add," and then type "Everyone" in the
dialog box that appears.
6. Click "Check Names," and then click "OK."
7. Select "Everyone" in the "Group or user names" list.
8. Under Permissions for "Everyone," select the "Full
Control" check box
in the "Allow" column. Note that the "Read" check box
in the "Allow" column is now also selected.
9. Select each user, in turn, in the "Group or user
names" list, and then verify
that no check boxes are selected in the "Deny" column.
Clear any check boxes that are selected in the "Deny"
column.
10. Click "Advanced," and then select the "Replace
permission entries on all child objects with entries
shown here that apply to child objects" check box, and
then click "OK."
11. Click "Yes" if you are prompted for confirmation.
NOTE: You should also check the firewall and the proxy
server settings and
configurations, or ask the appropriate administrator to
do so.
----------------------------------------------------------
----------------------
You can work around this issue by adding the following to
the exceptions list in the Internet
Options Proxy Settings:
Windowsupdate.microsoft.com
V4.Windowsupdate.microsoft.com
Download.Windowsupdate.com
To access the Exceptions settings.
1. Open Internet Explorer
2. Click "Tools," and then click "Internet Options."
3. Click "Connections," and then click "LAN Settings."
4. Click "Advanced" and add windowsupdate.microsoft.com
to the exceptions list.
----------------------------------------------------------
----------------------
1. Open Internet Explorer, click "Tools" and then
click "Internet Options."
2. Click "Advanced".
3. Scroll down until you see "Use HTTP 1.1 through Proxy
Connections," and then select the
check box.
4. Click "OK."
5. Close and restart Internet Explorer. You should now be
able to connect to Windows Update.
----------------------------------------------------------
----------------------
Rename the subdirectory C:Windows\System32\Catroot2 to
C:Windows\System32\Catroot2temp\.
Restart the computer and then try to run Windows Update.
----------------------------------------------------------
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>-----Original Message-----
>I am unable to perform an update on my windows XP
machine
>via windowsupdate.microsoft.com. Every time I go there,
>it tries to get the update for the windowsupdate
>software. Yet it is unable to do so. I have turned all
>of my security settings to lowest in IE and set my
>privacy to accept all cookies. What could be the
>problem? I have IE6 and am currently downloading SP1,
>but this has worked before I had SP1.
>
>Danny
>.
>