Elements 18 upgrade stopped working

Hi - I installed the upgrade to Elements 18 yesterday and the programme worked fine.  Today, when I switched it on it, it wanted to upgrade Camera Raw, which I agreed to.  Now the Elements 18 editor won't work.  It gets stuck on "Reading Workspace Mode"   I have tried uninstalling Elements 11,  (my previous Elements), uninstalling18 and re-installing.  Still the same problem.   Any help will be gratefully received.  Otherwise, I will be sending the programme back.  £70 is too much to spend on something that does not work.