I'm probably not qualigfied to help but I do know that TeamViewer can be on your computer without a full installation using the
QuickSupport module (a small, single-use .exe file that runs without installing)
Also, where did you get that Windows PC manager? It does not come with Windows 11 but is an add on so maybe it came with that? When this pop-up is there, launch task manager and see if it will give you a clue and you can kill the pop-up from there as well. You can look at the Properties of the task and see the path . . . (?)