It's actually a difficult process
How to Stop CCleaner from Starting on Windows Tutorial
CCleaner remains a popular computer optimization tool, despite the program’s history of privacy issues. By default, it starts with Windows, scans for junk files, checks for updates, and (in the Pro version) cleans your PC on a schedule. But if you find that this slows down your operating system’s boot time, you can always opt to stop CCleaner from starting automatically.
Disabling CCleaner from Starting Up Using Windows Task Manager is not always effective because the program runs multiple processes that force it to launch at startup. To prevent CCleaner from starting automatically, you need to disable several settings in the program. This tutorial will guide you through the steps to prevent CCleaner from starting automatically in Windows.
To prevent CCleaner from starting automatically in Windows, you need to visit the program’s Options panel and disable settings related to monitoring, scheduling, and updates. To do that:
