Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I'm having the same problem, with the "system" program. I checked it in task manager, as stated above it cannot be "ended" in task manager.
I tried to update from the File>Account>Update Option>Apply Updates, which was highlighted in yellow and said:
Office Updates
Updates for this product are ready to install.
Version: 15.0.4517.1509