Microsoft’s Autorun update v2.1 now automatically deployed from Windows Update <- Published: March 3, 2011
Microsoft have moved their Windows Autorun V2.1  (967940) update patch from optional updates to automatic updates. This is the same patch that was released in last month’s patch Tuesday. When Windows update is next run, this patch will automatically be selected to apply to your machine. This is more likely to affect home users, as companies should be using group policies to control how USB autorun settings operate.
Microsoft Security Advisory (967940): Update for Windows Autorun <- Published: February 24, 2009; updated February 22, 2011