HELP!!!!

My files are encrypted by a real ransomware – Hades Locker virus! all files have .~HLfab51 extensions and i have found a real ransom note. It’s quite scary, because I have no idea what can these viruses do. I haven’t lost important data as this computer is brand new, but I want to know what should I do next? I have downloaded the Tor browser and entered the “payment” site, but what if I am not going to pay the ransom these stupid criminals ask?