Qemu ( http://www.qemu.org/qemu-doc.html ) is the emulator, yep for sure we still need old OS in transition.
In fact most program that I have to use in generic no need to open in Windows; only problem that now I face, Thai language and Msn IM.
I see that in my Firefox for English page, flawlessly display; In compare to Thai, Look weird and hard to read.
For MSN IM, even hardly using it, I still wanna have the rich interface as on Windows XP; The greed never gives mercy on anyone.
So from now on I have to tear on two tier, Sabayon itself, and Qemu as emulator.
Wish that I can do it as fast as I wish.