My iMac is no longer visible on my local network after upgrade to lion

Prior to upgrading from Snow Leopard to Lion, my iMac and it's shared folders were visible under the "Network" folder of my Windows 7 PC.
After upgrading to Lion, I can't see my iMac from my Windows 7 PC or, obviously it's shared folders...  I suspect there is a configuration setting somewhere that needs to be modified, but I just can't seem to find it.... any suggestions/direction would be greatly appreciated.
Ellen

appears that apple has changed SMB code, and now its not possible login from windows on mac.
i installed snow leopard and now works fine.
apple is capable to make it run paying new license of smb code, but isnted of this, apple has created new protocol smbx and now, all others need to adapt your code to apple..
bad movement.. i am thinking sell imac and no back to apple anymore..

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