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Set your email account to require a second form of authentication in addition to your password whenever you log into your email account from a new device.When you log in, you'll also need to enter a special one-time use code the site will text to your phone or generated via an app.Change your password to a strong password that is not related to your prior password; if your last password was —and if your name is actually Billy Joe, you shouldn't have been using your name as your password in the first place.Try using a meaningful sentence as the basis of your new password.It might result in a threatening message, erased hard drives, frozen computers or corrupt files. The damage delivered is known as the virus's payload, and it can hit right away, after a specific allotted time after delivery, or the virus may go off on all infected computers on a predetermined day and time.So the next time you get an email with an attachment from a friend—and it seems perhaps just a little unusual—think twice before opening it.

A virus can go through your online address books, scan your old email files for names, or even look at your documents or spreadsheets to find names and email addresses to attack.

One way computer viruses find their way onto computers is through emails or, specifically, attachments that are sent with an email.

A virus lurking in an email is like what you've see in old crime shows on TV, where someone receives a package in the mail and inside there's a bomb. It will look like every other email you get, but inside there's danger in the form of a hidden computer program that will hurt your computer and/or steal data from you and others.

Check out two-step authentication setup instructions for Gmail, Microsoft’s and Hotmail, and AOL.

And for a full list, check out Sometimes hackers might change your settings to forward a copy of every email you receive to themselves so that they can watch for any emails containing login information for other sites.

As an extra security measure, also change the passwords for any sites that story your credit card information, like your Nextlix, Amazon and credit card company.