FSX and multiple OS's - Is that possible?

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Hi everybody, do any of you know if I can export my FSX registry and installation data from my current OS (Vista 32) to another partition's registry (namely XP or 7 beta), in order to run the sim in both OS's?

I'd like to see if XP or 7beta, with their lower resource consumption, would allow me to gain some FPS, but without reinstalling the whole thing on the new partition.

Thanks in advance!