Sarah,
I have given up on all the assorted options given in these posts.
I accidentally found what I am hoping is a permanent solution (at least on windows 10)
in the taskbar area of desktop, far left click on the windows symbol.
click on settings / apps / apps & features / scroll down to "copilot" highlight it / choose "uninstall"
when I did this, it disappeared from taskbar and apps & features (did same thing to corona, I hate AI)
(Do not see it in control panel / uninstall or change a program, but don't know if it is considered a program since it is an app or would have even been listed in this section)
I cannot find it and am hoping beyond hope it is permanently gone!
If you do this and find it is permanently gone, please reply and let me know how it worked for you, OK?
thanks