I really like these two malware detection removal programs. Malwarebytes.org and Spybot Search and Destroy (from safer-networking.org) with Teatimer always running will give you an alert any time any program is trying to make any changes (ie install the darn encryption ransomware). It asks "this program is attempting to run/do this... " and you have to say yes or no.
Ransomware is very bad stuff as it is just about impossible to get any of your data back without paying for that decryption key program.
best policy is to never open any attachments unless you are expecting them and know what they are. If you think it may be important but are not sure, you can always call the person to verify.
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