you can remove that buy replacing tex_operation_guide_base in system_plugin.rcowith a dummy file you also have to remove the text,. in the Text Data tab of recoedit in system_plugin.rco it is called:"msgsystem_option_with_icon
you also have to look into the photo_browser.rco/music_browser.rco/video_browser.rco and the topmenu_plugin.rco for text used with this guide base.(in topmenu its called something like "back to msuic player"/back to rss channel" etc etc)

hope this helps