(CBS) -- In March, Sherry Thomas was shopping on her brand new laptop when it locked up and she got a pop up saying her computer had a virus and she needed to call tech support.
She dialed the number and the person on the other end said she could fix the problem but needed remote access to the computer.
"So I gave her access to my computer, she got in there and started doing a whole bunch of stuff, she started doing a lot of things," Sherry says.
The person on the phone claimed to fix the problem and charged $179 to Sherry's debit card, but the whole thing was a scam.
"This is a massive, massive problem," says Better Business Bureau International Investigations Specialist Steve Baker.
Baker authored a new report showing how con artists are raking in millions.
"Lots and lots of people have been ripped off by these tech support frauds and they don't even know they've been ripped off because they think they really did have a problem with their computer and really there's nothing wrong with the computer," he says.
A survey found that 2 out of every 3 people have been exposed to one of these scams, and experts say when a con-artist takes control of a computer they can also install spyware.
"In fact, in a lot of cases they are getting people's online banking credentials and then logging into people's bank accounts later," Baker says.
Sherry soon realized she had been scammed and had her laptop cleaned by a computer expert.
"I felt violated. I felt dumb. I never knew they could come through your computer like that," she says.
A month later she got another call from the con artists, who tried to rip her off again. But this time, she hung up.