I've just had a call from a friend describing how their distraught daughter has had her computer "hacked" AND it was a phone call from a Microsoft Engineer that told her so...
...the "MS Engineer" then went on to tell her how to remove the virus from her machine and, no doubt, do several other things to it as the same time. Oh, they also told her that her "operating system license" had expired and so would need to renew it for the cost of £150.
Obviously, this is a total scam aimed at the non security savvy pc user. I've told her to change all usernames and passwords, etc. and will be wiping/restoring the hard drive for them later.
Seems it's a growing problem: http://www.computing...-targeted-phone-scam
(No doubt, there are better links and information elsewhere.)