This thread's last reply is from June 18, 2018, 9:42 PM UTC. Software, malware, and removal-tool
advice below may be out of date — treat specific steps and download links with caution.
Gary R
The best place to go if you have problems with Ransomware is .... https://www.bleepingcomputer.com/forums/f/239/ransomware-help-tech-support/
and the first thing you need to do when you get there is to identify the type of Ransomware you've got .... https://www.bleepingcomputer.com/forums/t/608858/id-ransomware-identify-what-ransomware-encrypted-your-files/
After that, follow the instructions for how to open a Ransomware help topic ... https://www.bleepingcomputer.com/forums/t/608844/how-to-post-a-topic-asking-for-help-with-ransomware/ ... and wait for help.
Decrypting files that have been encrypted by ransomware is a highly specialised subject, so it's best to leave it in the hands of specialists, and the ones at Bleeping Computer are the best I know. Please be aware though that not all files encrypted by ransomware can be decrypted, so whether yours can or not is highly dependant on which ramsomware variant is responsible for encrypting your files.