text: Cannot access network shares... - Page 2 - Windows 7 Help Forums
  Nope, that's not it either. I'm running samba 3.x which supports NTLMv2 passwords, plus the share is set to a guest account which doesn't use a password. I've tried changing that registry key and specifically setting encrypted passwords on the samba box as well.
  My roommate who's running Vista which is NTLNv2 can still access the box fine.
  Ok I found a reference to a sa,ba share and error 1240 there is n ot solution but it might helps you [Samba] System error 1240
  Just curious, have you tried from another user on the same computer to see if you can pinpoint the problem to a per machine or per user problem?
  This is driving me nuts. I'm getting so frustrated I'm fixing to just format my computer. I've been a server admin for years and have never had an issue that has made me pull out my hair so much.
  EDIT: Yes I tried creating a new user.
  And make sure you don't have any cached credentials that you are attempting to connect with prior to getting the authentication prompt. This will cause problems.
  1- See if you can connect via the IP address rather than the NETBIOS name. i.e. \\10.0.1.13\Share
  2- Check for cached credentials in control userpasswods2, Advanced tab, Manage Passwords
  Edit: Saw your reply, if it happens w/ the another user then neither of the above would help
  Ok so this is weird. It's a problem with my router. I bypassed my router and connected to our main gateway wirelessly, and I can connect fine now. Gotta check my router and see what's blocking it, something must be blocking windows file sharing on it, since I could still ping and SSH into the linux box.
  Guess it wasn't an issue with my computer afterall! But thanks for your help everyone.
  I take that back, still try using the IP Address.
  Also do you have the Online ID (Windows Live ID) component installed? It is used remote media streaming but causes problems w/ SAMBA shares. Don't ask me why though
  Glad it worked w/o the router but it may still be an issue w/ your W7 network setup. W7's firewall could be dedecting multiple networks and granting different rights to each.