This is a system instability error, not a CCleaner program error.
People get 'memory could not be written' errors due to hardware/Windows problems not specific programs like CCleaner.
Starting some programs causes this error to show up, yes but it's a hardware/Windows problem, not CCleaner's.
If you have an overclocked system or stability untested system, installing Windows from scratch at stock speeds then immediately installing CCleaner before anything else may show CCleaner running just fine on this very system.
I have a dual boot and have gotten this very same error in the past, I reimaged my system and the problem went away, it was not a program-related error.