Windows 7 has upgraded security.  This will effectively cause trouble in making connections to legacy apps (ie. Windows XP supported).  One of them is Samba on Unix.

Fortunately, there’s a solution to this:

1. Open Control Panel.
2. Choose Administrative Tools.
3. Click Local Security Policy.
4. Under Local Policies and Security Options:
   1. Change Network security: LAN Manager Authentication Level to “Send LM & NTLM responses”
   2. Change Minimum Session Security for NTLM SSP to disable “Require 128-bit encryption” into “No Minimum Security”.

Illustrations below: