I have this slight problem and I cannot seem to zero-in on the problem. I have 3 systems on my network, all of which are Win 7 Pro w/SP1. The problem is they can see each other on the network, but cannot access the printer and/or files. The Windows Security box pops up that asks for a password. It's weird that password protection is disabled and that this box occurs most of the time while the rest of the time it will work, as in the security box does not pop up. All the necessary services are running and yet I still can't seem to find the problem.