Always state your full Windows version (e.g., WinXP SP3; WinXP 64-bit SP2)
when posting in a forum or newsgroup. Please do so in your next reply.
What anti-virus application or security suite is installed and is your
subscription current? What anti-spyware applications (other than Defender)?
What third-party firewall (if any)?
Has a(another) Norton or McAfee application ever been installed on the
computer (e.g., a free-trial version that came preinstalled when you bought
it)?
How to troubleshoot Windows Update, Microsoft Update, and Windows Server
Update Services installation issues:
http://support.microsoft.com/kb/906602
1. See the "Need more help? Tell us what problem you are having" section of
http://support.microsoft.com/ph/6527
2. You cannot install some updates or programs
http://support.microsoft.com/kb/822798
3a. Check your WindowsUpdate.log (%windir%\WindowsUpdate.log) for errors
associated with the download/install.
How to read the WindowsUpdate.log file
http://support.microsoft.com/kb/902093
3b. Compare errors to those listed here:
http://www.bleepingcomputer.com/blogs/mowgreen/index.php?showentry=1122
and/or go to
http://windowsupdate.microsoft.com > click on Help and Support
link in left pane > Solve problems on your own.
4. Windows Update-specific newsgroup:
news://msnews.microsoft.com/microsoft.public.windowsupdate