In Vista it's Start/All Programs....Windows Updates.
Check all updates and let it do it's thing.
It will require a re-boot...go ahead.
NOTE: One of the recent Vista updates issued had an abnormal startup period upon re-boot...again just be patient and let it finish. Grab a coffee or Adult beverage of your choice.
I believe i timed it on my system and it was 8 + minutes or so...this could be longer depending on your system.