If you are a Windows user and trying to update your OS in a routine manner, you may get this message that says that you need to get an important update called PLATFORM UPDATE FOR WINDOWS VISTA X64-BASED SYSTEMS KB971644. There are many who see this message from Microsoft but when they try to download and install this important update, they get an error message 80070002. You may delete temp files and try to reinstall this update but nothing seems to work. Click on Start and then type Windows update in the search box. Check available Windows updates. Alternatively, you can easily get PLATFORM UPDATE FOR WINDOWS VISTA X64-BASED SYSTEMS KB971644 here.