Sounds similar to a problem we've had in the UK recently. People would get cold called by an Indian person claiming to be from Microsoft, they would say that they've detected a virus on your computer (how?) or that there was a problem with windows that needed fixing (lol, windows update anyone) and that they could fix it remotely for you. When they had access they would then say they needed to install some software (which was infact spyware). They would then try to charge you for it, if you refused, they would activate the spyware and take control of your computer and then try to extort money out of you.