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If you still need that driver - you can use the driver for keyboard RT7D00 - I am using it with my new keyboard RT7D30 and everything works. You can find that driver on www.dell.com if you are looking for drivers for a Dimension 4550. This is how I found the driver I am using.
I tried loading those drivers; however, it does not allow my hot keys to work.
Ultimately, I am trying to figure out why my function keys do not work. I am unsure if it is the keyboard drivers or something within XP.