I would love to test for you as I have Windows 7 64 bit and test DX skins for RedneckDude but I am not a skinner.
I think starting out, at least until you feel comfortable with your skinning, you should consider having one of the community skinners look at your work. I know RedneckDude has done it for other skinners starting out in DX and there are many who have helped out with WBs. Just send a few of them an email or PM.