No FN key on keyboard. I was using same DELL reinstallation CD that I used in November. I finally got to the setup file and selected new installation, but this time it asked for Product Key (did not in November). I have two computers running XP Home SP3, one is DELL Dimension 9100 (the one I'm trying to re-format) and a DELL laptop. I think this DELL CD is from the laptop which I bought refurbished from DELL in 2010. The only COA sticker on it is for VISTA, not XP and it came with XP loaded on same. In short, I apparently don't have the Product key for this CD because when I enter the Product key for the DELL 9100 computer, it rejects it and the laptop sticker has Product key for VISTA.
What I can't figure out is why the CD is asking for the Product key now and didn't in November.