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Microsoft provides Windows Update to keep its operating system up to date, and other programs may have their own background processes - Google Chrome and Firefox are examples - or check for new versions when they are run.
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People who have been using it to update Windows programs over the past decade are now looking for a replacement - and if you have not been using a vulnerability management program like this, you should consider it. Secunia's Personal Software Inspector 3 (PSI) has been discontinued by Flexera, which bought it in 2015.
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KC Softwares' SUMo (Software Updates Monitor) could be a replacement for Secunia's PSI
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