If you don't already have Microsoft security software, or you want to reinstall it, see our software download page.
If you're using Windows XP, see our Windows XP end of support page.
Unfortunately, there is no standard for how software programs can be updated on your computer.
However, we've listed the general guidelines that can be followed when looking to update a program. For example, if you have Windows XP and want Windows 7 you would "upgrade" to Windows 7.
For a list of the latest updates see the change log.
Windows will automatically download and install updates once a day for you.
This is the same as when Windows automatically downloads the update, and can be useful if you aren't always connected to the Internet or haven't turned your PC on for a few days.
The editable version of the definition can be found at Definition/Unstable.
See authoring process for more information, and see translations if you want to contribute a version in another language.
To help categorize the unique states of computer software as it is developed and released, each update has a version number (e.g. When a software program is updated, it changes the version of the program to help identify the fixes that have been applied. However, if you had Windows 7 and needed to install fixes for security vulnerabilities or other problems you would "update" Windows.
See our version page for further information on this term. See the upgrade definition for information on this term.