Standard things to check
1. if using win7 or vista the launcher and gaemcleint exe is set to run as admin
2. there is not a firewall or antivirus program , windows defender or some parental control softeware blocking the program;s access to the net.
3. firewall / router/ or ISP is not blocking the ports or delaying the packets the game uses. (7000-7500)
Column 1 and 3 have values around 500 kb/sec (outgoing/incoming), column 2 has values around 20 kb/sec (transfer rate). If the values in these columns is less than what is expected you may have filtering or blocked ports either on your personal network or from your ISP.
4. make sure yur IE browser is not set to work offline and clear the IE cache (even if you use a different browser)
besure to include you connection set up,
ie wireless direct connect modem/routers models number and versions, nic used and type of isp you use