Accessing files on Dual Boot system

I have two computers on my home network. One is a Mac and the other is a PC that is dual booted with Windows XP and now Windows 7. Everything works fine when I boot to the XP system and the PC computer and shared files show up as being available on the Mac. When I boot to the Windows 7 system, no PC computer is ever available or the files that I am sharing. Both the XP and Windows 7 systems are showing as having the same IP address. Is there anything that I need to do special to share the Windows 7 PC or files. I have tried everything that I can find.


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