Infected by TeslaCrypt and Files Encrypted - What to Do?

 "TeslaCrypt infection!!! A message popping up on the screen and it says that all my important files are encrypted and it asks for $500 to get the private key for decrypting files. Is it ture? What should I do?"

Overview of TeslaCrypt

TeslaCrypt is a ransomware that created abd released by cyber criminals who want to rip innocent users off by scaring them to pay for encrypted files decryption. Promoted by some certain free download and fake update, this new ransom virus can get its infiltration to systems easily.