Unable to run ccleaner7 working in the background?
That doesn’t tell us why you can’t run it.
Is it getting stuck on the ‘Welcome’ screen?
If so then: Go into Windows Settings and set the display scale to 100%.
Run CCleaner 7 and get past the Welcome Screen.
Set your display scale back to what it was.
If it isn’t launching at all then you may have a faulty install. If you go to Windows Settings > Apps and click CCleaner 7 it should show you options to Repair or to Uninstall.
You can download a new v7 installer from here: Download CCleaner builds | CCleaner Portable, Slim, and more
If you can’t get CCleaner 7 to work then you have the option to roll-back to v6.39: