Tor4pay.com itself isn't malicious. It's just a web page with your OS and IP address information as well as instructions on how to pay the ransom. If you were redirected to this web page then your computer is probably infected by CryptoWall virus.
The updated virus also has unique bitcoin payment addresses and more aggressive file encryption and deletion algorithms. To remove this virus from your computer, please read this removal guide.
Your files are encrypted.
To get the key to decrypt files you have to pay 500 USD/EUR. If payment is not made before (time/date) the cost of decrypting files will increase 2 times and will be 1000 USD/EUR.
Written by Michael Kaur, http://deletemalware.blogspot.com