Sage Desktop suddenly won't load

Sage Desktop suddenly won't load.  It immediately shrinks to the taskbar and never opens to log in no matter how long you wait.  It had been working fine.  Sage system verifier shows everything is ok.  No new windows updates were loaded between working and not working. Plus no new apps were loaded. This is a windows 10 6 4bit machine.  Other windows 10 machines work fine. I can open individual apps without a problem.  Is there anything else to check?  Will a reinstall help?