Right now that domain shows as being "available".
OP, either you did not sign up with CO.CC for that domain, or you took too long to set up the account and they recycled it.
Please go to http://co.cc and register http://biatu.co.cc, making sure to set the nameservers to ns1.x10hosting.com and ns2.x10hosting.com. Once you do that, your website should be working in under 48 hours.
Now that your problem has been solved, I am going to close this thread to mark it as resolved. Feel free to create a new support ticket if you need more help or have any additional questions.