CCleaner not opening Windows 10 can be caused by issues with the registry files of certain applications. To fix the problem, you can try deleting the affected CCleaner entries from Registry Editor.

Is CCleaner Windows 10 compatible?

CCleaner is fully compatible with Windows 10 but can sometimes encounter issues. For example, you might receive a message like this saying This app can’t run on this PC (see screenshot).

Is CCleaner bad for Windows 10?

CCleaner, a popular PC optimization app, is being flagged up as ‘potentially unwanted software’ by Microsoft Defender (formerly Windows Defender, but renamed with the May 2020 Update), which is Microsoft’s built-in antivirus for Windows 10.