I know this post is pretty old, but I was also looking for a guide to setup P2Pool on Windows. Did you ever have any luck setting yours up? Or does anyone else know of a guide for windows?
My above post describes it all. It works fine for me in windows 7.
M
But how did you set up the merged-mining part?
Edit: If anyone sees this and was looking because they had the question I did, it's an option in p2pool. "--merged"