For most people, Windows 10 security updates are slated to stop on October 14, 2025, just over 10 months from today. That could end up being a serious security problem, given that Windows 10 is still the version used by a large majority of the world's PCs. Users will be able to buy a one-year reprieve for $30, and businesses and other organizations will have the option to pay for two more years after that.