Crypto-type malware is particularly nasty to deal with because it encrypts files. While an infected file has had code added to it which antivirus can remove, an encrypted file isn’t repairable without the unique encryption key that was used. The criminals using crypto-type malware intend to sell you the unique key, giving you access to your files for a price. For this reason, crypto-type malware is also frequently called Ransomware.
The key to dealing with crypto-type malware is prevention and planning. While it is assumed you have antivirus and IPS protection in place, the criminals using crypto-malware are constantly updating code to avoid detection by these systems. Since the damage these threats do is often irreversible, taking additional steps to protect yourself is advised.
Check this similar therad: https://www-secure.symantec.com/connect/forums/all-my-files-were-encrypted#comment-10864631
Also could you share how you decrypted files.