I assume your bookkeeper is using Xfce as the desktop environment. In Xfce the bar across the bottom is called a "panel" (you can have more than one, but in Vector Linux Standard 5.8 Xfce has a default of only one. In your case the panel disappeared - in other words it crashed for some unknown reason. To restart the panel, you should be able to type Alt-F2, then type "xfce4-panel," then hit the "Enter" key or click the "Run" button. To ensure that the panel appears the next time you log out/log in or restart the machine, make sure that when you log out or turn off the machine, the box next to "Save session for future logins" is unchecked
, so that it looks like this:
I hope this helps.