Proliferation of locky files.

I need help. Many of my files are being changed to locky files. I have had no ransom demand. How do I stop this and why didn’t avast prevent it?

https://forum.avast.com/index.php?topic=53253.0

There is no tool in the world that has 100% detection/protection.
Roughly 300.000 new malware is discovered each day.

https://decrypter.emsisoft.com/ a suite of decryption tools