There is a new virus that encrypts user data (see here), according to MBAM the pro version protects against infection (see here).
MBAM Pro is usually £20-25 for a license but following this link you can get it for less than half of the usual cost.
Go here:
https://store.malwarebytes.org/342/purl-winzip
Change currency in top right to US Dollar, $14.95 is about £9.30.
It's a good app to run regardless but as there are no methods to decrypt the data without paying the ransom it's best to be proactive and this won't get in the way as much as a bulletproof firewall.
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