Folders wont change

Hi everyone
Ive tried to change my folders to some black ones ive found but not all of them have changed.It seems totally random as to which ones have changed and odder still if i right click on an old style folder and press delete the confirmation pop up displays the correct folder image.Ive altered the imageres.dll in both system32 and syswow and have tried clearing the icon cache but not all folders display the new image.
any ideas thankyou

And a reboot may be required.

Not sure.
Im curious though as to how you got the icons tab in the properties window...?