If you log in to Windows using a Microsoft account, take the extra precautions I've described to secure your data. Use separate and unique strong passwords for both the Microsoft account and the email account you use. Don't store sensitive files in your SkyDrive online storage account. And keep your Microsoft account up-to-date with your mobile number.
Even though your Windows 8 PC might come with the built-in Windows Defender or a third-party antivirus program turned on, compare your options and choose one of the better antivirus programs.
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