I can't open my default calendar - can't delete emails in inbox

My default calendar disappeared. and I get this message: Unable to display
folder: Errors have been detected in the file C:\Documents and
Settings|Mary|Local Settings|Appilcation Data\Micorsoft\Outloo\Outlook1.pst.
Quit Outlook and all mail enables applications, and then us the Inbox repair
tool (Scanpst.exe to diabnose and repair errors in the file. For more
information about the Inbox repair tool, see Help.
Well, I've done all this, several times, I have uninstalled outlook and
reinstalled it. I still cannot get rid of these emails and I can't open my
default calendar.