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I'm not sure if Vista does this (I'm on Widnows 7, and it does) but, it should create a System Restore point every time it updates. In this System Restore FAQ are instructions on how to do a System Restore.
You might be able to uninstall the suspect update(s) in Add/Remove Programs (or is it Programs and Features in Vista?). Just look for Installed Updates on the left hand side of the window.