unchecking the box in tweakUI isn't enought to get rid of the version number on the desktop. The problem lies in the fact that if the KEY is there, no matter what it is, a 0 or a 1, it will still paint the version on the desktop. the solution is to DELETE the key from the registry.. and since I've already experienced this myself, I know first hand. BUT since the key has been removed from my registry, I can't look up what it is!
hahahahahahah
anyways.. look under
HKEY_CurrentUser(or localmachine)/control panel/desktop/
in that folder you'll find something to the words of "PaintDesktopVersion" or "PaintVersionDesktop" or Paintversionondesktop or paintversionnumber or paint.. bah.. you get the idea..
if it's not in that folder do a brute force search for "paintversion" that should result in the key. anyways, happy hunting.
Remember, Delete the key, even if it's turned off (0), it'll still put the version number on the desktop.