Re: I need a hint )

If the tabs of the sheets and scroll bars were missing, it means that their settings were disabled in the settings of additional program parameters.
First, check to see whether the Show Sheet Labels option is disabled. Here's how:
For other versions of Excel: select File> Options> Advanced and make sure that the Show sheet labels check box is selected in the Show options for the next book section.
If this does not help, the file may be corrupted, then you need to repair excel file, you can learn more about this here . Good Luck!