Connect Mac to PC in network

i did what is in this video http://www.youtube.com/watch?v=JSm0YflelJ4 and it worked, but only on folders, tried similar thing for drives but didn't work, it shows on the mac but can't access it for some reason, someone can help with the drives sharing ?

btw the mac is lion, the PC is win 7.
also a way to make it auto connect to the PC would be nice too instead of having to connect everytime manually.

 

got it working now ^^.