Wireless Internet Card Problem!

I recently purchased a used Dell Latitude D600 with what I believe is the 2100 Intel(R) preoset/wireless card. 

 

When I first purchased the notebook, I could just push Fn + F2 and the wireless would be activated and I could go on surfing the net.

 

I recetly had to format my harddrive due to severe virus problems.  I do not have nay of the original disk for the computer, but I did install my Windows XP Home Edition that I had on hand.  Now the wireless adapter does not appear to even be on this computer.  I have tried installing the "critical" driver for the Intel(R) proset/wireless from the Dell website, but I still get 1 of 2 messages each time I try to open the icon in the systems tray.  Also when i push Fn + F2 now, nothing happens.  The messages I get are:

 

either: software was unable to detect a wireless adapter.  Please install a wireless adapter.

or: Driver not installed.

 

Do I have the drivers installed wrong or what do I need to do?

 

I would really appreciate it if someone could help me out with detailed instructions!!

 

Please Help!!!

 

Thank You!