Move Windows 7 Library folder

1. create the target Library folder, e.g. D:\music
2. go to "properties" to make sure the folder is shared (so a network path is showed).
3. go to "C:/User/xxx/My Music" -> "properties" -> "location", and point it to the target folder created
4. when asked whether or not the move the folder and everything, confirm with "yes"
5. now "C:/User/xxx/My Music" will no longer exist, because it's now at the new location; because the target folder is shared already, it can take the network name "My Music" while preserving it's real folder name "D:\music".