Win 2000 Product Key.... where to find?

[ekky]

I am selling my laptop, and I have lost the box where it tells me what my 25 key product code is for windows 2000

Is there any function on my computer I can use to locate it so I can write it down and pass it on to the purchaser (in case they need to re-install it etc)

same goes for Office XP

Any help would be MUCH appreciated