Evo 3g I'm having connection problems

[Xpert]

In such cases, check that:

• Your computer’s operating system is compatible with EVO.
  
• Your computer meets or exceeds the minimum operating requirements for your operating system (Windows or Mac OS X)
  
• You are not using any software known to conflict with our modems
  
• Your USB port is working properly, so that you can plug in your modem
  
• If you have an anti-virus protection or a firewall, you switch it off when installing your USB modem software or make sure you select 'Allow during installation'