Typically, you receive these error messages when one of the following conditions is true:
1. A network cable is disconnected.
2. The modem has been disabled.
3. The modem drivers are corrupted.
4. Spyware is running on the computer and is interfering with the connection.
5. Winsock has to be repaired.
6. Third-party firewall software is blocking the connection.
For more detailed information click the below link
[url]
http://support.microsoft.com/kb/892889/en-us[/url]