There are two I can think of:
1. When I make certain changes to the Start Menu, a message appears that says "this will affect all users, do you want to continue?" Since I'm the only user for my computer, this dialog box is completely useless, but there seems to be no way to disable it.
2. In Office XP, when you paste text there is a box which gives you the options to "keep source formatting," "match destination formatting" or "keep text only." Almost always I want the last option, so I would like to set it as default, but again I have not found a way to do that.
If you can find fixes to those it would be great!