http://www.snopes.com/fraud/telephone/microsoft.asp
Microsoft says about this fraud that:
Microsoft does not make unsolicited phone calls to help you fix your computer
In this scam cybercriminals call you and claim to be from Microsoft Tech Support. They offer to help solve your computer problems. Once the crooks have gained your trust, they attempt to steal from you and damage your computer with malware including viruses and spyware.
Although law enforcement can trace phone numbers, perpetrators often use pay phones, disposable cellular phones, or stolen cellular phone numbers. It's better to avoid being conned rather than try to repair damage afterwards.
Treat all unsolicited phone calls with skepticism. Do not provide any personal information.
If you receive an unsolicited call from someone claiming to be from Microsoft Tech Support, hang up. We do not make these kinds of calls.
Read more at http://www.snopes.com/fraud/telephone/microsoft.asp#6ermDWQpi2KDtddK.99
