There have been a number of telephones calls received in the last few days from persons in the USA pretending to be from Microsoft.
They usually speak in an Indian accent stating that your computer has a problem that they offer to resolve over the phone. This may be along the lines that the computer has a problem with its operating system or with Windows.
One person received a call recently and she did not even have a computer!
Simply terminate the call. Do not pass on any information whatsoever, including your name. Its a phishing attack designed to entice you into passing on your personal details. Microsoft do not approach people using the phone about computer security issues.