Petya Ransomeware.
Looks like WannaCrypt (WannaCry) ransomeware has died out, and a new threat has taken it's place.
This one appears to have originated out of Ukraine.
Underlying infection spread to older versions of Windows by the exploit know as Eternal Blue.
Same exploit used by WannaCry, released by Shadow Brokers in April 2017. Said to have been stolen from NSA toolkit.
Not only can clicking on a BAD link infect one computer, with Eternal Blue it is possible to infect ALL computers on the Local Network.
Sounds like upgrading to a newer version of Windows, not such a bad idea. MS can be snoopy, but beats hackers trashing all your valuable data.