Unable to install Antimalware because a competitor product is installed. Remove competitor product and the install will proceed.

I'm getting this error in ZCC on one computer, a notebook that lives elsewhere to which I don't have regular access.

The user insists she has nothing else installed, and when I was able to take a brief look at it I couldn't see anything installed either.  The in-built Windows Defender stuff is working fine, so I've let it go for a bit... but I'd like to get this resolved.

Is there any log I can look at that will tell me exactly what it thinks is installed or what files it's tripping on?