Exact same problem I have. It really is shit seeing that my NW-E405 is only 256GB and its basically the same as any other MP3-Player. Now because Sony wants to be 'special', I have to use other mp3-players. I really hate when I can't get things to work you know . I tried reinstalling things too with no result. It finds a Network Walkman, but thats that. No extra folder in 'My Computer'. I have this problem on both my laptop and my PC :@. sry but having a sony device really really sucks.