03-31-2009, 11:09 AM
Are you trying to install that update directly, or are you going through the windowsupdate.microsoft.com website? I often get that error message when I try to install an update directly that is not needed on my PC. If you open IE and go to windowsupdate.microsoft.com assuming you're using a legit copy of Windows it will autodetect what if any updates you need and install them for you. As far as the "conficker" worm for tomorrow, Symantec has a detect and removal tool for that specific threat on their website somewhere.