Windows Explorer – Display File Count and Subfolder Size in Windows XP

This link provides some tweaks that might solve it

(but it's too long to copy-paste here)

Possible cause:

Vista sets the Explorer window view settings and folder type template according to what folder types are in the window.

This will show you how to reset the Windows Explorer folder view settings, turn off Automatic Folder Type Discovery, and increase the folder view cache to have Vista remember the view settings, folder type template, size, or position of a specific window for when it was last closed at the specific path location.

The exact cause of Vista losing it's memory on your folder view settings has not been found yet. This may just reset them for now to help Vista remember them again. It has been noticed that changing a lot of window folder view settings in combination with some unknown applications settings may be triggering this forgetfulness.

Make sure that you do not have a setting in a 3rd party program set to clear the folder view setting cache when it is used. (EX: CCleaner - Window Size/Location cache option under Cleaner -> Advanced)

I've also noticed the following problem: if I click on "Documents" on the left and then click "Clients" in the main pane, I get a listing not of the subfolders of "Clients", but instead what looks like a listing of the hundreds of files in the entire "Clients" folder tree."Clients" folder tree.

I was able to replicate this issue. It looks like you have the Clients folder set to arrange by Date modified. This will group the contents of the subdirectories by date modified. This is why you have the Today (3) group in you screenshot. Instead, you need to set the folder to arrange by Folder: