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28 Sep 2012  

Windows 7 Ultimate x64, Windows 7 Professional x64, Windows XP x64 SP3

If you're absolutely sure that there has been no change on your network then may be worth going into control panel, further into Windows Firewall then on the left you will have "Allow a Program or feature through Windows Firewall"

There will be a button near the bottom that says "Allow another program" - it will appear in the list, feel free to tick all boxes beside it and try again.
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