“YOUR COMPUTER MAY HAVE ADWARE/ SPYWARE VIRUS”, How to Remove?

A message saying that “YOUR COMPUTER MAY HAVE ADWARE/ SPYWARE VIRUS” and you should call the 1-201-591-3780 number for technical assistance appears on your screen suddenly? Is that true? If that is a fake alert, how to remove it?

“YOUR COMPUTER MAY HAVE ADWARE/ SPYWARE VIRUS” is a type of adware which is able to take over your web browser and deliver fake security alerts by Microsoft Security Essentials to collect illegal money by scaring users to call the given number 1-201-591-3780 and cheat them to pay for a clean computer. As a matter of fact, the message is sent from http://microscustomersupport.com/clientarea/Index.php website to fool users.