CrazyJaney,
Some people use a flash drive to do this. Try using an ethernet cable, it should connect, unless you recently installed/reinstalled the oeprating system.
You can try, start, control panel, device manager, network adapters, double click on the Dell Wireless 1397 WLAN Half Mini Card, click on advanced. Look for Antenna Diversity and change it from Auto to Aux.
Restart the computer.
If it doesn't connect, then make a system restore point and uninstall McAfee using the McAfee Removal Tool
Restart the computer and try to conect.
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Power off your ISP modem/router and your wireless router(if any) for 30 seconds. Then power on the ISP modem/router. Wait 15 seconds, then power on the wireless router(if any)
Restart the computer and try to connect.
What happens?
Rick