You might need to check your network configuration settings as well as login credentials validity. First go to Start > Control panel > Network and Sharing Center > Network Adapters. Right click the active LAN/Wireless connection and then make sure the IPs are correct in the IPv4 section. Additionally, disable the firewall or allow the application to connect to the servers (if it uses online login). Secondly, contact the IT administrator and ask information about the connection to servers as well as the credentials validity.
