View > Toolbars = un-check the Toolbars you want to hide

Or, uninstall the extensions that added those Toolbars.
http://kb.mozillazine.org/Uninstalling_toolbars

There are other things that need attention:

Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.

• Java Plug-in 1.6.0_13 for Netscape Navigator (DLL Helper)

Update the Java plugin to the latest version.

• http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)