File sharing, new to Mac

Hi,

I got my kids an iMac & I'm thinking about getting one for myself, but I'm having trouble figuring something out, how do I share files across my network? I have all of our pictures on my windows 7 machine & I wanted to play with them in iPhotos, but I can't can't seem to find out how I can connect to PC to get access to the files. I've already setup file sharing of the directory on my PC & I can do it with the other Win 7 PC on my network, but not my Mac, what am I doing wrong?

TIA