Are you going to pay the ransomware to Russian hackers for such an old system that is not getting security updates?
Install Rollback Rx and you don’t have to pay ransomware. You roll the machine back to before the virus hit, and good to go. You can also do full system backups and restore if you need to, which takes longer. The rollback rx is a huge safety net agaisnt viruses and computer malfunctions, and well worth the price for,the paid version. You can run it free, but it’s a little limited