I have a slightly different issue. In my context menu only the "Aero" look is gone and I get the ugly classic look. I don't have powerdesk, suite or any of that installed. This happened after the update.
This is with it disabled in Shexview

This is with it enabled

Also, it and the browser helper are the only things marked as "suspicious" in Shexview.
[edit: renamed subject to reflect actual issue.]
Message Edited by Tony_Weiss on 07-06-2009 08:49 PM