A computer scam in Northern Ontario could cost you a lot of money if you fall for it. Con artists claiming to be from Microsoft tell homeowners they have to let them clean their computer because it’s infected with a virus. If you refuse, they say they’ll take away your computer. If you believe their line, they next ask you to pay with a credit card and ask for your credit card number. But don’t give them your number because the scammers don’t represent Microsoft and your computer doesn’t have a virus.