Tech support fraud is a growing issue, experts say.
The Better Business Bureau and the Federal Trade Commission say they've been studying phony computer tech support groups who take advantage of people.
This happens when crooks put software on your computer, saying it's infected with a virus, and then they want money to fix it.
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People are getting pop-up windows that play messages asking you to call a certain number and pay money to get your computer repaired.
The BBB and FTC are working together to help keep track of the issues. They warn that companies won't ask you to call a phone number to unlock your computer.