Also you might try doing a reset of IE settings as mentioned in this blog post:
http://blogs.msdn.com/ie/archive/2006/06/12/628499.aspx

Or also try the batch file posted here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3326.4

If something has gotten messed up in your Internet Explorer installation (like something mangled in the registry or whatever), that can have a bad effect on MoI's UI as well.

- Michael