I wasn’t able to see my Mac network share from Windows 7 and the single edit to the security policy that worked for Vista, didn’t work for Windows 7.
It turns out a second step was needed, as detailed below:
Click on “Local Policies” –> “Security Options”
Navigate to the policy “Network Security: LAN Manager authentication level” and double-click it to get its Properties. By default Windows Vista and Windows 7 set the policy to “NTVLM2 responses only”. Use the drop-down arrow to change this to
“LM and NTLM ? use NTLMV2 session security if negotiated”.
Then naviate to the policy Network security: Minimum session security for NTLM SSP based (including secure RPC) clients, double click and untick
“Require 128-bit encryption”