This is the right way to do it. Make it clear this IT process is causing reduced performance. Especially if you’re a profit centre you will likely see the problem solved soon enough.

This specific thing. A password on task manager is really dumb though. I assume they have some spyware they don’t want users to be able to stop. But, most of this kind of software (think antivirus) generally have other ways to prevent tasks being closed. They don’t need to remove task manager. Task manager is an important and needed tool for any windows user.