I use ES File Explorer too and I strongly recommend it. IMO its a beautiful, intuitive and powerful app.
In my experience you don't need to do anything special to access disks on other PC's other than click the search button (within the ES File app) which scans for those other PCs.
You can find that button by:
- clicking local/lan popup (at the upper left of the screen)
- click LAN (from the popup men)
- click search (on the window toolbar )
I didn't need to set my PC up as a server for this to work, (but I suppose its possible that it had been set up that way from some other PC app in the past).
Pete