Share 'Outlook or IE 8 help...'

I'm not sure what happened, but I upgraded from IE 7 to IE 8 yesterday, and since that point, or at least I think that was the point, my computer has been messed up. When I try to open my Outlook I get a couple of error messages. Here's one: cannot open the outlook window. the set of folders cannot be opened. the file c:\users\nicki\appdata\local\microsoft\outlook\outlook.pst is not a personal f…