Hi
Please clarify,
What is the version of Operating system you use?
How do you connect to the internet (DSL, Cable or wireless)?
Did you made any changes to the computer in the recent past?
Give us the Error message you get while access the game
Steps
Try to give full permission to the gaming file under the McAfee firewall program permission
Click internet and network-configure-click on the advance button under the firewall protection is enabled-click program permission make sure gaming file (exe) is given full permission to inbound/outbound