Outlook Reminder refuses to be 'dismissed'

I have deleted several appointments which had been recurring appointments. However, I have ghost reminders -- that is, reminders that pop up and which I cannot 'dismiss'. I have run Windows diagnostics but that did not change anything. Does anyone have any suggestions?
nancy

 

Try a repair and if that does not work uninstall and then install outlook. I have seen this before but cannot remember the fix as it was a few years ago.

 

I did a repair which did nothing. Ok, uninstall and reinstall. Can I just ask a really STUPID and BASIC question: will that process wipe out my inbox, calendar, tasks etc? For some reason I am never 100% complete when I export everything and reinstall. Thanks for answering a basic question.
nancy

 

When you uninstall your .pst file which contains all your data will stay intact and will be picked up after the reinstall.

 

Thank you! Will try tomorrow the uninstall, reinstall process