The Internet Explorer Manager process is always a 64-bit process in 64-bit versions of Windows 8 or later operating systems. This is an architecture change in Internet Explorer 10. By default, tab processes can be either 32-bit or 64-bit processes, except when the TabProcGrowth registry entry is set to 0.
Internet Explorer 9.0 (Vista x64) Internet Explorer 9.0 (7) Internet Explorer 10 (Windows 7) Internet Explorer 1.0; Internet Explorer Comments
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Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page.Windows Internet Explorer 7: New user interface, tabbed browsing, The 64-bit versions of Vista require that all device drivers be digitally signed, so that the X6GCRw5.