Posted: March 26, 2012
Adding the following registry settings in Windows 7 solved this problem for me:
HKLM\System\CCS\Services\LanmanWorkstation\Parameters
DWORD DomainCompatibilityMode = 1
DWORD DNSNameResolutionRequired = 0
I found this solution at this page: wiki.samba.org/index.php/Windows7. Unfortunately, this page no longer exists.