This item is misleading/unsafe — there is no official "Windows 7 Service Pack 3." Microsoft released Service Pack 1 (SP1) for Windows 7; later updates were delivered through Windows Update and individual patches. Any download claiming to be "Windows 7 Service Pack 3" is almost certainly unofficial and may contain malware or pirated/modified system files.
: In 2016, Microsoft released a "Convenience Rollup" (KB3125574), which many people informally call "SP2," containing updates from SP1 up to April 2016. Unofficial Versions windows 7 service pack 3 download 64-bit