I have two controls that I want to add to a userform and when I try to draw them on to the form I receive an error message that simply say "Unspecified Error". These two controls are the 'Microsoft Slider control, version 6.0' and the 'Microsoft Treeview control, version 6.0'. The bit I don't understand the most is I know I have used the controls on this computer before.

Has anyone idea what this error message means and how I can resolve it?