Hi
There are alternatives to M.$. Explorer.
I use a free version of xplorer2, available from
http://www.zabkat.com/This has an option to "Measure" (and display) the size of all folders and files.
If I select C:\ it immediately shows the size of ever file, and the name of every folder.
When I click "Measure" it takes 6 seconds to inspect the entire sub-directory structure and show the size of each folder (together with sub-folders, and to report a total size of 9.8 GByte. It takes only 1 second if I have selected C:\Program files (total 1.4 GBytes)
If you really want it to you can have it automatically measure whatever you select, BUT depending upon what you select it may be sluggish in responding - and every second or two Windows itself automatically hits something within C:\Windows which invalidates that measurement and replaces its size with "<folder>" - and automatic measurement may well be continuously busy refreshing the size every time Windows sneezes.
I chose this because it has two panes. I can select files and folders within one pane and then move, or drop copies, into a different target region in the other pane.
Before this I often found that when using Windows Explorer I could select things in the right hand half, but when I tried to drop them into a very small folder icon in the left hand half I might miss by a millimetre and they would go to totally the wrong destination.
Regards
Alan