Hello Karstan,
Thank you for your reply, I want to keep the encrypted files so that later on i may find a decryption tool for it. I also made for them a backup on portable hard disk as they are very important files for me, i want to be sure that my PC now is free from any malware or ransomware. what is your opinion should i format my PC? or recover an older version of windows? and then try to recover my lost files by recovery programs
I have done the steps you told me about but 3 programs AVG, AVG web tuneup, smiley couldn't be uninstalled as they told they are unsuccessfully installed or they aren't there on my PC. I don't know how?