An update is available that will help improve the performance and reliability of Windows Vista. If you are not sure whether Windows Vista Service Pack 1 (SP1) is installed, see the “How do I find out whether I have Windows Vista SP1 installed?” section.
To install the correct version of this update, you must know whether your Windows Vista platform type is 32-bit or 64-bit. If you are not sure which platform type is installed, see the “How do I find out whether I'm running a 32-bit or 64-bit version of Windows Vista?” section.
If you do have Windows Vista SP1 installed, and you know whether your Windows Vista platform is 32-bit or 64-bit, you can download the update by clicking one of the following links: