If you have to ask, you're using 32 bit. Start/run winver, if you are using
64 bit, this will tell you so. The 64 bit version only runs on *very*
expensive hardware.
Take your computer outside. Place in on the ground and hit it with a
sledgehammer twenty times. Count the number of "bits" it breaks into;
that will tell you what "bit" version of XP you have.
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