I hope someone can help

I have not used solidworks for a few weeks. A couple of days ago I was forced to upgrade to hotfix 4.6 when I started it again.

And after the upgarde, when ever I try to start solidworks, it opens the splash screen and indicates "loading registry". After a few seconds, it closes and nothing else happens.

I have tried:

1. uninstall all Dassault systems applications, delete dassault