Stan H. had posted about receiving a questionable email. At the risk of redundancy, am posting another response.
Unless a gracious friend finally notifies them (an un-knowing hack-ee 'sender') of receiving a suspicious message - supposedly from them, people are usually not even aware their (the Hack-ee's) email address 'book' has been stolen by a hacker.... Should you be a recipient, check the Subject line first, and if the 'message' is another link for you to open.... Best to delete it, or communicate with the Hack-ee before opening. When you open one of those messages, YOU will become the next Hack-ee!! If you were (the previously unknowing Hack-ee), best and quickest solution is to CHANGE YOUR PASSWORD FOR THAT EMAIL ACCOUNT! Then, run your malware program - often. I have no connection to them, but I am very pleased with Best Buy's WEBROOT system. It automatically 'sweeps' every 24 hours, or if I haven't run it, it notifies me when/if there is something suspicious. A scan or removal takes usually only 2 to 3 minutes or less. Their 'Geek Squad' even answers my questions! FYI - I have a Windows 8 operating system.