the performance optimizer won't start with the statement " we are unable to start the service required to run this feature".
Same here after Windows 11 Home Reinstall
I get the same message. Why isn't anyone providing help?
You can try to start the service manually to get some details about the issue. If you open Services (for example by clicking the start menu, typing "services" and clicking the Services icon which appears) and find a service named "CCleaner Performance Optimizer Service", you'll probably see that it's stopped (its status is not Running). If you right click that line and select "Start" from the menu, the service will attempt to start. If that fails, I'd expect an error message to pop up. It won't most likely contain a tremendous amount of detail, but it could shed a bit of light on the issue. Can you try that?