Major problems with Acrobat 8 - Adobe Acrobat

Is anyone else having display problems whenever they try scrolling while
Acrobat 8 is not maximized? Whenever I scroll less than a page, the display
becomes garbled (see attachment).

Also, is there a way to permanently get rid of the Navigation Panel Buttons?
I hide them every time Acrobat starts, but they keep coming back again.
There is no setting in the Customize Toolbars for the Navigation Panel
Buttons.

Thanks,
-Jeff