when the update comes on check and write down the number of it then go into add/remove programs to see if it is in there (usually near the bottom). If it is you dont need to have it. If that is the case, when you do an update just uncheck that one so not to download it again. This is what happened to me once on a update.
If it is not there download it then come of line and stop your antivirus then install it if you are happy to do that. As long as it is from microsoft web site that is. Hope this is a bit of help for you.