It seems as though windows vista has some issues with the samba share version used in most LANSERVER devices.

Below is a registry fix that users have reported to resolve this issue, I have not tried this myself so please use caution when changing registry values, it might be a good idea to backup your registry first.

The key:

  controls the security level mandated or allowed for logins.  In Vista it defaults to 0x3, which       means "NTLMv2 only".  This is not supported by Samba2

  The fix is to change it to 0x1, which means "use NTLMv2 if available,

    or older versions if not."  Reboot.  Samba shares will work just fine.

                                                     OR

You might want to try out the latest NAS_BASIC 47 Beta which is intended to work with Windows Vista available on the download page