I have noticed this bug for a while now, I'm not sure if it is only on the OS I tested (XP and 2003).
When CCleaner cleans IE, 4 empty folders with random names (X5UQK, UJ1LE etc) are created. This happens each time CCleaner cleans, and the folders are never removed. Obviously this can lead to lots of empty folders over a period of time (I had over 900 when first notice).
The folders are:
%userprofile%\Local Settings\Application Data\Microsoft\Internet Explorer\DOMStore
and
%appdata%\microsoft\internet explorer\userdata
I don't know if CCleaner is to blame or the call it makes to a windows component to clean the area, I hope a dev can look into it.
Thanks.