UPDATE: 2018 Anit-ransomeware tool, if your anti-virus doesn’t already have something like this built-in: https://www.bitdefender.com/solutions/anti-ransomware-tool.html
You may have heard about the hideous and insidious “malware” going around now called “ransomware”– it gets on your machine and encrypts files, then pops up a message telling you how to get the files unencrypted for a fee… here is some great info put together by folks at ThirdTier (a group of IT Pros who help other IT people)…
http://www.thirdtier.net/2013/10/cryptolocker-prevention-kit-updates/
TO BLOCK LINKS IN MICROSOFT OUTLOOK: