Beware new strains of Crypto virus doing the rounds. There are now free tools to prevent this kind of attack. One such free tool is available at: https://www.foolishit.com/cryptoprevent-malware-prevention/
Or Malwarebytes also doing a free anti ransom ware tool at: https://malwarebytes.box.com/s/znlajk1tlmzbm2x3vb4enkik7lreqxd9
If you get this virus ALL your stuff is gone, unless you have encrypted backups you can kiss goodbye to your data including anything in Dropbox and cloud backups if open.
Get protected now -its free!