I've been having the same problem where Microsoft Office products wouldn't run at all and some other programs would only run if I ran them as administrator. I'm using CCleaner Pro V6.13 on Windows 10 (Home, 22H2) with BitDefender as AV. After reading off2hcky's post, I tried running Excel while watching the Task Manager and observed the same brief appearance of a CCleaner task (despite having already exited CCleaner). I uninstalled CCleaner and I was immediately able to run Excel and all of the other previously affected programs.
