Answer by Chris S for windows server 2008 file permissions

On Folder A:
Set Everyone to Read & Execute
Set System to Full Control

On Folders B & E:
Enable Inheritance - Remove any explicit permissions

On Folders C, D, F, G:
Disable Inheritance - Remove All Permissions
Set [Corresponding Group] to Modify

Users will be able to override and change these permissions if they are Admins, there's no way around that.