Install Samba on OS X

Samba is an open source project that is continuing to develop a freely available implementation of the SMB and CIFS protocols. Since it's open source, volunteers and computer enthusiasts collaborate to develop the software. You can read more about the Samba project on their website, http://www.samba.org.

Follow these instructions

http://macs.about.com/od/macwindows/ss/sharemacfilesxp.htm