The cold callers claim to be from Microsoft IT support and warn homeowners that they have a problem with their PC, but then install viruses and steal data once they've been given permission to log on.
Victims are also charged for the service, as the fake Microsoft representatives tell homeowners to buy an annual support contract or protection plan to help prevent system crashes.
The investigation by consumer watchdog Which? found that 18 per cent of those targeted had their credit cards used fraudulently and more than half of victims had problems with their computer after following instructions from the cold callers.
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