I've got a Pentium 4 machine - the exact architecture is GenuineIntel x86 family 15 model 2 stepping 7. (I'm running Windows XP Pro, version 2002, Service Pack 3 with no problem.) This is a 32-bit machine, right?

Right click on my computer and read there, it will tell you 64 bit, or if it says nothing about it, then it is 32 bit.

of course,
x86=32 bit system
x64=64 bit system

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