Microsoft has released several new updates and hotfixes via Windows Update since the public availability of Windows Vista SP1 Beta and RC (Service Pack 1 Beta and Release Candidate), such as KB943899 (fixes to improve the performance, responsiveness, and reliability of Windows Vista) and KB943302 (Vista Application Compatibility Update). However, for system that has installed with a version of Vista SP1 Beta or RC, these newer updates that released after SP1 Beta or RC versions and not included in the service pack, will fail to install the these latest updates with message saying updates cannot be applied.
But there is a workaround. Read the guide HERE
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