To fix this, write menuload in the command panel. Then a box will apper. klick on load, and choose acad.cuix.
If you now klick on the ribbon panel it will appear.
It is not showing as you have directed. It is just showing EXPRESS, when I type menuload. PLease help.
Had the same problem. After typing MENULOAD had to unload the AutocadLT file that was already loaded. Then it let me load the CUI and all the panels reappeared. Note- before doing the above, I copied in an older version of the CUIX file into the folder just in case the current one had been corrupted.