Studio 2019 does not start

Hi, I installed SR2 for Studio 19 and can no longer open Studio, I get this message "'Sdl.TranslationStudio.AlignmentEditor.IAlignmentEditorService' could not be started" I cannot even return my license to reinstall Studio 2029. Please help. Repairing the software is not an option that is offered.  Please help. Thanks. -- Diane