The phone rang today. The accented voice on the line claimed my computer was sucking in bad stuff off the net, and he worked for Microsoft, and wanted to help me. I was suspicious but decided to play along and see what his scam was. About the time he got me to download from www.teamviewer.com, I told him I would call him back.
A quick Google for PNF scam turned up a dozen accounts of this scam. So, I never did find out just what the scam was, but, I can repeat to all of you, that unsolicited phone calls from companies are scams. This call was trying to get me to download some dreadful virus.
If you don't already know, beware of phone scammers.