Most people suffer a malware infection because they fail to run the latest version of whatever software they use — or fail to download and install the latest security patch. The average infected computer system hasnt been appropriately patched in many months or even in years. Patch everything as soon as the update appears, patch first, reboot if needed, and then — and only then — go back to work. Never install software from a link arriving in email or from a remote tech support person who called you to notify you that your computer is infected.”]
Source: https://www.csoonline.com/article/3010159/4-dos-and-donts-for-safer-holiday-computing.html