It's been bugging me for a while, on the regional setting page I get a Keyboard type of 00000409 when working on Win XP Pro (x32) or Win XP x64, but strangely enough not when working on Win 2000.

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Everything still seems to work OK though, any ideas as to why?

One possibility:
Yes, there's a thing called keyboard substitutes. I dont know if thats exists on win2000 tho.
goto current user in registry and find keyboard layout\substitutes
on my current x64 sp2 test install in vmware, 409=414