A service pack (SP) is a Windows update, often combining previously released updates, that helps make Windows more reliable. Service packs, which are provided free of charge on this page, can include security and performance improvements and support for new types of hardware. Make sure you install the latest service pack to help keep Windows up to date. Service packs take about 30 minutes to install, and you'll need to restart your computer about halfway through the installation.
The recommended (and easiest) way to get updates such as service packs is to turn on Windows Update for Windows 8.1, Windows 8, Windows 7, and Windows Vista and let Windows notify you when the updates you need are ready to install.
In Windows 10, updates are automatically downloaded unless you're using a metered connection. Learn more about
keeping Windows 10 up to date.
Learn how to identify what version of Windows and service pack you're running
Find out how to
upgrade to Windows 10.
Get more familiar mouse and keyboard options, plus easier access to your apps and controls.
Install the Windows 8.1 Update (KB 2919355)
What's new in Windows 8.1 Update and Windows RT 8.1 Update?
Windows 8.1 is a free update to Windows 8 that you can download from the Windows Store.
Get the Windows 8.1 update
Learn how to get the Windows 8.1 update
The latest service pack for Windows 7 is Service Pack 1 (SP1).
Learn how to get the right service pack for Windows 7 installed automatically today with Windows Update (recommended).
Get SP1 (advanced)
Support for Windows 7 RTM (without SP1) ends on April 9, 2013. Learn more
What's included in Windows 7 Service Pack 1 (SP1)
Troubleshoot problems installing a service pack for Windows 7
The latest service pack for Windows Vista is Service Pack 2 (SP2). To install Windows Vista SP2, you must first have SP1 installed.
Learn how to get the right service pack for Windows Vista installed automatically today with Windows Update (recommended).
Get SP2 32-bit (advanced)
Get SP2 64-bit (advanced)
Support for Windows Vista Service Pack 1 (SP1) ended on July 12, 2011. Learn more
Get SP1 32-bit (advanced)
Get SP1 64-bit (advanced)
What's included in Windows Vista Service Pack 2 (SP2)
What's included in Windows Vista Service Pack 1 (SP1)
Why won't my hardware device work after installing a Windows Vista service pack?
Why can't my computer play sound after installing a Windows Vista service pack?
Why am I prompted to activate Windows after installing a Windows Vista service pack?
Why do I get a "missing system component" error when installing Windows Vista Service Pack 2 (SP2)?
Important: On April 8, 2014, Microsoft retired technical support for Windows XP, including security updates that help protect your PC. If you continue to use Windows XP, your computer might become more vulnerable to security and virus risks.
Learn more about end of support for Windows XP