almon -

Brilliant.  I was frozen on the stupid QB login window, could only exist aby Crtl-Alt-Del and terminate via Task Manager.  Then I read your suggestion: 

use the Alt-F4 key combination then click the CANCEL box

That closed the box giving access into my QB Desktop - note to all the QB "Team" --- MY DESKTOP.

I immediately implemented the other fix described above in this chain:

 EDIT > PREFERENCES > INTEGRATED APPLICATIONS > COMPANY PREFERENCES

Then Check DONT ALLOW ANY APPLICATIONS TO ACCESS THIS COMPANY FILE.  

Prompted to ask if you area sure, click OK and smile.   Hopefully bye-bye to the Intuit Intrusion.