On one PC, I also had the problem that the GUI was frozen immediately after starting. (The installation went through without any problems). This problem is definitely related to the HealthCheck. If I deactivate the HealthCheck via Registry, the GUI works. Afterwards I compared the settings with another PC and found the cause. The other PC has the following additional CCleaner setting: "DisplayIM=1-1|2-1|". If I add this setting the GUI works again even if HealthCheck is activated.