you have got attacked by ransomware. all of your files got encrypted by a hacker and the encryption method is very high, so it's tough to decrypt your files without following the hacker's procedure. so I think it would be best if you format your hard drive completely with partition and start from new again.
keep in mind that don't set up anything or don't give permission to any unknown objects or your browser without knowing its trustworthy. self-awareness is the only way to be safe in this virtual world
Please appreciate for deeds! Because everything is not like sleeping easy............
I gave up sharing premium accounts. So no more message please regarding this issue.