How do you tell if you OS is 32-bit or 64-bit

I want to upgrade my system and I want to use my existing XP, but only if it is 64-bit (to use 4 GB of RAM). How can I tell if my current version of XP is 32-bit or 64-bit?

I actually have two XP versions, Home and Pro, both are the 2002 versions.

I looked in "system" from the control panel and it just says XP Home, 2002 version, but does not say wether is it 32 or 64 bit.

Thanks for looking.
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  1. Nevermind,

    I found this archived post which tells me how (using winver).

    http://www.tomshardware.com/forum/50426-45-finding-windows-edition

    Note to self - do search first!!!!!!
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