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I can't comment on 64-bit since I have yet to make the switch myself (and I'm ready to, just haven't researched which plug-ins I'll keep), but if I'm reading your post right, you're going to rollback an installation? Never do that.
Anyway, anything you had working prior to the OS switch will work exactly like it did on your last OS, and will probably even run smoother due to a clean installation.
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