It is easy to remove the ransomware
, but your files are lost. As was mentioned, even if you go to Walmart and buy a GreenDot card and pay the ransom the server is shut down by the FBI so will no longer work. Since it uses RSA (and NSA backdoored AES) encryption with public keys not even the NSA can decrypt your files.
One hope is using ShadowExplorer (if you don't backup) to see if any shadow copies are present to recover your files or at least an older version of them.
Man, you sure aren't alone. Bleeping Computer has a complaint/report thread
that is only 3 weeks old and is 37 pages as I type this. Wilder Security is accumulating an equally impressive complaint thread. I feel badly for all who have had their files encrypted with no recourse. This is really the first I have seen of a truly destructive piece of malware in years.