We had a small number of early customer reports, that in some cases, this update (KB935509) was being offered for installation on all Windows Vista editions vs. just Ultimate and Enterprise. A quick adjustment of the applicability logic was released shortly there-after to refine the edition offering behavior. For systems set to download and install updates automatically, the update will not install even if it has already downloaded, so most people will not be affected by this at all. Customers who installed the initial release of the update on editions other than Ultimate or Enterprise should not be concerned as the update will have no negative impact on their systems – it was designed to install on all versions of Windows Vista, it is just not required on any of the others for SP1.
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