iBook can't connect to PC shared folders...

I just bought a new iBook and I love it. I've got my wireless network up and running and I'm having a great time with my machine.

I'm having a problem though. I can't get all of my Windows shares to show up. My PCs and the Mac are all on the same workgroup, I have all of my folders shared on my PC, but when I connect to the server, the only thing showing up to mount from the PC is the My Documents folder. I have other folders that are shared on the PC that have my music and videos, and they won't show up no matter what I do. I unshared then reshared the folders, turned off SMB on the iBook then turned it back on, and still nothing. I did this for a friend about a month ago on his PowerBook and never had a problem. Does anyone have any idea how to fix this? Thanks.