The Ransom Note:
Hey, at least they left a note.
To decrypt files you need to obtain the private key.
The single copy of the private key, which will allow to decrypt the files, located on a secret server at the Internet. After that, nobody and never will be able to restore files...
To obtain the private key and php script for this computer, which will automatically decrypt files, you need to pay 1 bitcoin(s) (~310 USD). Without this key, you will never be able to get your original files back.