Can't update, fix, nor scan my Mac. Why?

Today I went to scan my computer and decided to get it updated first.  The update was going on and on and on til it said that it needs fixing.  I clicked on the button to get it fixed and it went on and on and on.  When I tried to update and fix it never did.  When I tried to scan the hard drive it automatically went to fix.  It did tell me that it self-updated a week ago.  The program is up to date.