But recently I faced one serious problem - I upgraded to Windows 7 on one of my PCs (which btw have the largest storage space in my apartment) and I was not able to connect to it with my NMT. So I started to look for solutions.
Turned out that this problem is widely known and discussed, but usually it is solved somehow...easier than in my case, so I think that edition of Windows 7 matters in this case. (in my case it's Windows 7 Ultimate Edition)
After some investigation turned out that the exact solution for my problem is to disable this setting in Local security policy: "Restrict anonymous access to Named Pipes and Shares"
To do that you should go to "Control Panel/Administrative Tools/Local Security Policy/Local Policies/Security Options/Network Access: Restrict anonymous access to Named Pipes and Shares" and set it to Disabled.
Warning: Changing that setting could compromise security of your PC, so if your PC is not inside some private home network, than you should not do that change.
Also if you still cannot access your PC from NMT (or any other linux-based device), then probably this will help: http://anime.aoselectronics.com/wordpress/how-to-access-windows-7-shares-from-network_181/