Tech Service Scam

We are frequently requested to repair both corporate and private computers that have been infected with malware.  In the last three years the most prevalent problem has been the "Tech Service" Scam.  It is where some alarm appears on a computer that warns that it is infected and to call a certain tech service company with assistant to remove the infection.  Surprisingly, sometimes these warnings arrive by a telephone call from people claiming to be from an ISP or from Microsoft.  The warnings often are so dire that the "pigeon" reacts without thinking.
     The Anti-Malware Company that produces free and subscription Malwarebytes discussed this risk in greater detail in their post Beware of US-based Tech Support Scams found here
https://blog.malwarebytes.org/fraud-scam/2014/08/beware-of-us-based-tech-support-scams/