Can ping but cant connect to network shares?

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http://serverfault.com – I have a problem which I have been facing for some time; I can sucessfuly ping computers on my network; but I cannot access the network shares (Various operating systems including: XP, Windows 7, Windows Server 2008, Linux Ubuntu But it seems that when I connect to a computer via the network share: Windows Key + r \\computerip It shows there is a network problem; but the pings go through like usual; Further more. This spreads to my Linux machine aswel, I have checked the service for Samba.. This is running, but I cannot connect to network shares? (HowTos)