For sometime I’ve had problems connecting from my Vista laptop to my MacBook Pro. I’ve only been able to connect the other way. Finally a solution.
This thread recommends the following:
On the start menu in the search field type “gpedit.msc”, hit enter. This will open the group policy editor.
Go to “Computer Configruation” –> “Windows Settings” –> “Security Settings” –> “Local Policies” –> “Security Options”
In the pane on the right side of the screen, select “Network Security: LAN Manager Authentication level.” By default this read “Send NTLMv2 response only.”
Change “Send NTLMv2 respone only” to “Send LM & NTLM — use NTLMv2 session security if negotiated”
restart the client
If you use a famillial vista try this. You must modify the BDR
DWORD named : LmCompatibilityLevel must set to 1