Cannot start Microsoft Office Outlook. Cannot open the Outlook window.

I get the following error message when opening Microsoft Outlook (using Windows 7):

Cannot start Microsoft Office Outlook. Cannot open the Outlook window. The set of folders cannot be opened. Errors have been detected in the file.

C:/Users/owner/AppData/Local/Microsoft/Outlook/Outlook.pst.

Quit Outlook and all mail enabled applications and then use the Inbox repair tool (Scanpst.exe) to diagnose and repair errors in the file. For more information about the inbox repair tool, see Help.

I have tried the suggested fix of using the start menu, clicking "run" and then typing in "Outlook.exe /resetnavpane" and it did not work. Do I need some sort of a longer path to make this work?

I cannot find the so called "inbox repair tool" and don't know how to use "scanpst.exe".

Are all my old email folders now lost? How can I start using my Outlook email again?

Thanks for any help. Susanne