Internet Explorer browser hacked by atieclxx.exe but won't let me delete it. Deep scan didn't help

Using IE release 12 I keep getting routed to different sites when trying to navigate any site.  I think the culpret is "atieclxx.exe" but it won't let me end it from "Task Manager, processes", I get "access is denied".  It doesn't appear in the programs listing so I can't delete it there.

I did a deep scan with Norton 360 premium but that didn't identify it as anything - trusted, untrusted, etc.  Will try Power Eraser" today and see if that catches it.  Otherwise... how can I remove this program??  (Firefox has not been affected.)