Kevin - just to clarify a few things
You are saying WiMAX - WiMAX is for wireless Internet networks similar to cable or fiber for large areas and not wirless inside your house hooked up to your cable modem. Your network card supports both internal wireless networks and pay for wireless like WiMAX.
To confirm - you hit the blue function key AND F2 at the same time?
If you go to Control Panel, there
may be an icon for Dell's network adpater / connection manager besides the windows one. If you go to Control Panel > Network Connections > Adapters, right click on the wireless and see if it is disabled.
2 - Dell occasionally has issues with the Dell Control Point software screwing up wireless where I have had to remove it a few times and use the built in wireless control from M$ ...
3 - I believe this is the driver you want :
Drivers and Downloads | Dell [United States]