There are a few ways to eradicate the virus, but your files are toast. Possibly try an earlier Restore Point, or from your backups.
http://www.symantec.com/security_response/writeup.jsp?docid=2014-061923-2824-99
http://www.wintips.org/remove-cryptowall-virus-and-restore-cryptowall-files/
How to get your files back after Cryptowall infection.
Unfortunately, a FREE decryption tool or method to decrypt Cryptowall encrypted files DOES NOT EXIST (until the day this article was written – at the end of June 2014). So the only options you have to get your files back are the following: