For many many months now, everyday I get a message to install update "Security Update for Windows XP (KB946648)". Every time I install it, I get a message saying that it has failed to install this update. If anyone has a solution to this problem please reply to this thread. This has been bothering me for months now.

I would ask in the XP Forum, http://social.technet.microsoft.com/Forums/en-US/itproxpsp/threadsbut this thread may help:http://social.technet.microsoft.com/Forums/en-US/itproxpsp/thread/c4283601-ad69-4647-8ad9-3e7b0cce1b05