Custom Inventory

I have followed several articles on creating a custom inventory script.  They each differ.  I do not know scripting, powershell, etc.  I have created the new data class  but cannot figure out how to create the custom inventory.  It is a simple one-I just need to collect the drive letter and directory names.  Do not need the files. Is there anyone that can write this so I can get on with this? Desparate at this point. BTW, this would be for Windows.