Unfortunately, vCloudz servers are down and you can't use the software anymore. As an alternative, I suggest you try another VOIP application from Software Informer database. Personally, I recommend you Skype, FreeCall, or Ventrilo. All of them are free to download and install, easy to use and don't require many resources. Also, you need to make sure that your security program and Windows Firewall doesn't block the software connection.