Thanks, I have heard that this is a frequent problem in XP and 2000. I might try cleaning up uninstalled apps that are laying around, perhaps that will help. But why would that matter, if they are just sitting there? This is a confusing one. At least one of those links is a "how to cope with it" though, which is helpful, but I'd also like to know how to get rid of it. But I first need to understand why it happens, it happens when I've not tried to maxmize a window although perhaps an app made some sort of call to a Windows API that tries to. This is a strange one.