First things first, make sure wireless is turned on.

Usually there is an LED for wifi lit up to denote its on. if not check the manual or have a look at the function keys.

 

Mine is Fn+F2...to turn it on/off.

 

Once it is on that you get a wifi icon on the right hand bottom corner. Right click on it and click on view availiable networks.

It will scan for networks and then you can select your network.

 

ALL Dell laptops use the key combo of FN+F2.

 

Now for the serious part.  Upgrade from WEP to WPA.  Your network is totally insecure by using WEP.

 

 

http://willsit.com/resources.aspx

XP:

Setup:
http://www.microsoft.com/windowsxp/using/networking/setup/default.mspx
http://www.pcworld.com/video/id,368-page,1-bid,0/video.html
http://www.practicallynetworked.com/howto/
http://www.microsoft.com/windowsxp/using/networking/default.mspx

Connection Issues:
http://www.microsoft.com/windowsxp/using/networking/maintain/troubleshoot.mspx

File Sharing:
http://www.theeldergeek.com/quick_guide_to_simple_file_sharing.htm

Security:
http://www.ezlan.net/Wireless_Security.html

Vista Networking:

http://technet.microsoft.com/en-us/windowsvista/aa905087.aspx



TCP/IP stack repair options for use with Windows XP with SP2.
For these commands, Start, Run, CMD to open a command prompt.
Reset WINSOCK entries to installation defaults: netsh winsock reset catalog
Reset TCP/IP stack to installation defaults. netsh int ip reset reset.log
Reboot the machine.