All links I have for Win Update problems, disregard what isn't applicable to
you.
If Updates fail to install:-
If you receive a 643 error message or a message indicating that Windows
Update was unable to complete the operation. This may occur if the catalog
database (Edb.log) is damaged.
Try this:-
Click Start, click Run, type cmd, and then click OK.
At the command prompt, type the following command, and then press ENTER:
del /q "%SystemRoot%\System32\Catroot2\Edb.log
This command will force the catalog database to rebuild itself.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;817753
Errors Occur When You Try to Install Updates from the Windows Update Web
Site
If the Windows Update scan feature reaches 100%, and then displays "There
are no updates available at this time" message.
Verify that your computer's date and time are accurate and that the Internet
Explorer language option is not empty.
To check the language setting in Internet Explorer:
1. Click "Tools" and then choose "Internet Options"
2. Click the "Languages" button
3. Make sure at least one language is listed in the "Language Options"
dialog.
Windows Update Site Lists Updates That You Already Installed
Unable to download updates or there is an error message:
Start/Run - type CMD.
At the prompt, type the below commands (Press ENTER after each line)
net stop cryptsvc
ren %systemroot%\system32\catroot2 oldcatroot2
net start cryptsvc
Now try the install again.
http://www.updatexp.com/cryptographic-service.html
For information on the Cryptographic Services
Windows Update Troubleshooter
http://v4.windowsupdate.microsoft.com/troubleshoot/
Why can't I download updates?
http://www.kellys-korner-xp.com/top10faqs.htm
Windows Update Is Not Installed
http://support.microsoft.com/default.aspx?scid=kb;en-us;811269
This issue may occur if you use the AOL Web browser interface to access and
download Windows Updates. The AOL Web browser does not communicate properly
with the Windows Installer software, and this may cause Windows Installer to
stop responding.
http://support.microsoft.com/default.aspx?scid=kb;en-us;193385
WINUP: Problems When Viewing or Downloading From Windows Update
http://support.microsoft.com/default.aspx?kbid=326686
"Windows Update Was Disabled by Your System Administrator" Error Message
http://support.microsoft.com/default.aspx?scid=kb;EN-US;316524
"Administrators Only" Error Message When You Attempt to Use the Windows
Update Site
http://support.microsoft.com/default.aspx?scid=kb;en-us;319109
Windows Update Site Lists Updates That You Already Installed
http://support.microsoft.com/default.aspx?scid=kb;EN-US;319585
WINUP: "Software Update Incomplete, This Windows Update Software Did Not
Update Successfully" Error Message When You Visit the Windows Update Web
Site
