Your CPU is 64bit compatible.
Just grab a Window 7 64bit ISO and install it, Win7 product key works for both 64bit & 32bit.
You'll gain about 20% performance in MAME running 64bit over 32bit, with no extra cost.
2GB will work, but you might want to bump it to 4GB if your running 64bit.
It's alot easier than pissing around making your own builds.
If all else fails, Burn the manual.
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