There is indeed a 64-bit version of windows xp. I have both the 32-
bit and the 64-bit version. The problem is: Most things (such as
drivers for hardware, and screen readers) don't support the 64-bit
version of windows xp. Jaws, window eyes, and system access 32 do
not support the 64-bit version of xp, though there is one that does,
though I don't remember which one it is.
I had the 64-bit version of xp installed for a while, and had to
remove it, due to lack of drivers and screen reader support.
And, yes, there are different activation keys for the 32 and 64-bit
versions of xp.
hth.
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