In Windows 7 open Windows Explorer or Computer from the desktop.
Select Documents or My Documents depending on your folder structure/naming. Choose the view you wish to use. Now click Organize > Folder and search options from the menu. Click the View tab. Click the Apply to Folders button and click OK. All subfolders of that folder should now be displayed in the view you have selected.

Be aware you will need to repeat this for the different folder types, e.g. if you apply this to a document library, it won't be applied to the pictures library etc. You will need to repeat for Pictures, Video libraries, etc.