|This is something I have seen many times when using the wireless card manufacturers own connection software. Are you using the windows connection service or the card manufacturers software?|
To check, try this...
Right click My Computer and go down to Manage.
Expand Services and Applications and then click on Services. Scroll down and look for Wireless Zero Configuration. If it says Stopped or Disabled, double click it. A new window will open. Halfway down you will see drop down menu. Select Automatic. Click apply and ok. Now connect using the Windows connection manager.
If the above is not the problem, do you use a firewall other than Windows one? If so try turning it off, disconnect then reconnect.
Another thing that could cause this is if the computer is turned on before the router.
Computers... designed to entertain,help with work but most of all to frustrate you!