Add Hardware Wizard can't find driver

I purchased a Intel Pro/Wireless 2915ABG Mini PCI 2915 ABG 2200+'A' for my Inspiron 6000 and then downloaded from the Dell download site the driver (R138749) for this hardware. 

 

Here's my problem:  The Add Hardware Wizard in Control Panel can't find the driver.  

 

On the wizard, I click "Install from a list or specific location" then "Search removable media (floppy, CD-ROM...) and "Include this location in the search:"  

 

Upon clicking Next, a Browse for Folder window comes up.  When I go to either location that I have the file (copied to CD and also to a USB drive), the OK button is gray, making the selection unavailable.

 

When I place the driver file on the desktop and put the file after *\desktop\ in the "Include this location in the search:" command line, I get the message:  "The location you specified does not exist or cannot be reached.  Please enter another location or uncheck the 'Include this location in the search' box."

Any help would be greatly appreciated!