Depending on what hardware you have, you may have many "Optional" Windows Vista updates you don’t actually want to install. Possibly you just hate seeing all of the language packs available for update. If you don’t want to see these updates, there is a simple way to remove them from the list.
From Windows Vista Update, click View Updates, right-click on the update you don’t want and select "Hide Update." Now when you use Windows Update, you wont have to worry about seeing updates that are optional that you don’t want… That is until there is another unwanted optional update.