I suffer the same problems. In Reliability Monitor I find the following report:
Description:
Faulting Application Path: G:\Neue Programme\Windows Utilities\ccsetup portable\CCleaner64.exe
Problem signature:
Problem Event Name: BEX64
Application Name: CCleaner64.exe
Application Version: 5.66.0.7705
Application Timestamp: 5ea6ca85
Fault Module Name: CCleaner64.exe
Fault Module Version: 5.66.0.7705
Fault Module Timestamp: 5ea6ca85
Exception Offset: 0000000000b346d5
Exception Code: c0000409
Exception Data: 0000000000000007
OS Version: 10.0.18363.2.0.0.256.48
Locale ID: 1033
Additional Information 1: 42eb
Additional Information 2: 42ebd951ed8e6a2b5f2224c4caf19bf4
Additional Information 3: c424
Additional Information 4: c4245bc1b862299e9c0c85127c566990
Extra information about the problem
Bucket ID: 7001c7b272a8d75b3842d134c26b84ca (1748189629903504586)
My system is: Windows 10 Pro with all recent updates, Kaspersky Total Security 2020.