How to restore (or put encoding) documents on Vista?

Question

Character encoding

Hello everyone and I apologize in advance for the somewhat downed text of the narrative, since this event did not happen with me, I myself retell from other people's words and not completely, I have not seen it live yet.
The situation is as follows:in a Vista person. At one point, she issued a message "threat of penetration", offered something there, and in the end everything hung. To which the person simply rebooted the computer. As a result, everything flew off and Vista benevolently offered to restore everything. As a result, the recovery programs work, but almost all documents (docx, doc, txt) have become unopenable. More precisely, they received an additional prefix "fsyuihi" to their extension and, when opened, they give out fierce rubbish. Ran through all known encoders. There is a single file that opens as a set of Korean characters and Korean encoding (original text in Russian). The rest just look like a bunch of junk + have too little weight.
I attach the file itself.
Now my own two questions:
1. Does anyone know what the encoding is and is it possible to decode it, or is that all for sure?
2. Everyone's favorite fortune-telling by coffee grounds - I'm going to go and see it live. Can someone advise how to recover the data after all? Didn't work with Vista. Programs for recovery from disk? Or just roll back to a restore point?

Answer 1

You caught the encoder, and rebooted while it was working, it seems.
Say goodbye to data, and pay more attention to security.

Answer 2

+ 100500 for the ransomware virus. Look for a decryptor on antivirus websites.