Quoth

Thanks people, you've been a great help.

Where do you recommend I put this command?

Not much else to say really, this just greeted me one day during my usual routine, Windows XP SP1. I tried to see if the "Rebuild Icons" in the TweakUI PowerToy would have any effect. It didn't. The problem is localised to the folders tree. Any help is greatly appreciated-- I'm getting really annoyed at not being able to tell drives from folders and what-not at a glance.