Windows networking with Mac

I recently used a demo ver of some software from Mirimar Systems called PCMacLan. It worked great. Here's the link. Good luck.
http://www.miramar.com/products/demodownload.html

Scott

If you have mostly PC's and want to add a small number of MAC's, there is a package called Dave http://www.thursby.com/products/dave.html which will allow a MAC to use Ethernet and TCP/IP, and share files and printers with PC's.

If you have a large number of MAC's and want to add a few PC's, use PC Maclan as mentioned in the previous answer.

Good luck.