With 32-bit windows, the athlon 64s behave just like ordinary 32-bit cpus. I believe winxp home and pro both support dual cores, but may need to do windows update before the second core is utilised.
This is a very common question about 64-bit processors.
As you know, Windows XP is 32-bit, but your processor is both 32-bit and 64-bit. It will run 32/64-bit applications both with ease.
64-bit means little today. You could upgrade to XP 64-bit, but then you need 64-bit programs and there is a lot of hassle. Not worth it. Just do everything the same as you would do with another processor.
Also, forget anything about XP Home incompatability with dual-core. You will be fine. EDIT: You may need an update, as has been mentioned.
But it looks like my question was answered here, yay. I was more concerned with it not working, period. But I think a single core will be enough to do windows update (only just)
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