Networking Lion

Hey guys got my new iMac 27" and have worked out how to file share, but one thing is I share only the iTunes folder and the Windows pc's can still see everything on the mac. Home folder, pictures, downloads etc. I can't work it out. Still can't get the printer to share or the A C Ryan media box that see's all the Windows boxes. It see's the mac just won't let me long in. Says log in failed no matter what password / username I use. I love the mac but networking it isn't something that works easy. Say what you want about Windows but I can have a network up and running it 5 mins with Linux, XP, vista or 7. Just don't add a mac in the mix with Lion.

Max