Outlook closing & restarting when typing emails

Every time I try to type an email a window pops up saying there is an error and Outlook is stopping the program.  At first it wouldn't restart, now it does, but when I type a little it comes right back. Has been going on all day.  Once in awhile another window will come up saying if there is a solution to the problem they will let me know.  Does anyone know what I can do?  Thanks!