I cannot connect to my iMac or my Mackbook from my Windows 7 PC after installing Lion. Worked fine with Snow Leopard

I have a 2009 iMac and a mid 2007 Macbook. I also have an HTPC running Windows 7. I can connect fine to the HTPC from either the iMac or the Macbook, however, I am completely unable to connect to my Macbook or iMac from my PC. This was never a problem prior to upgrading to Lion from Snow Leopard. Please be advised that I know how to set my network up and have tried everything possible. I upgraded my iMac to Lion first and noticed the problem. After checking my settings I was stumped. I noticed that my PC could still connect to my Macbook running Snow Leopard. I then, today, installed Lion on my Macbook and replicated the problem I was experiencing on my iMac. Any suggestions?

The same happens to me!!! Any help out there?

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