Back up your data, format the drive, and reinstall the operating system and needed programs. Make sure to back up your Internet browser’s favorites, personal photos, documents, and so forth. Turn on OS’s and application’s auto-update features so that they stay updated. Make sure all your applications, even your browser add-ons (Flash, Adobe Acrobat, QuickTime, and others) are installed and updated. If you share your PC with your children, don’t give them an admin account or password.”]
Source: https://www.csoonline.com/article/2633089/making-your-personal-computer-safe.html