wdg_pgh

OK, I am running 0patch, but i thought I had eliminated that as the problem by excluding CCleaner through the 0patch dashboard and then also by disabling the 0patch agent. CCleaner continued to crash in either case. I guess the problem is more subtle than it would seem. I am leary of mucking about in the registry, and since that didn't work for you I am going to wait for your followup. Thanks for the heads up.

I have been having this same problem. I note that the version of ntdll.dll shown in the problem signature is dated 1/2/2020 (I suspect that it was installed be the final WIN 7 update KB4534310). Could there be some incompatibility between the newer CCleaner versions and this version of ntdll.dll?

I had this problem after installing 0patch. CCleaner (Pro) would crash upon startup with the following problem signature: Problem signature: Problem Event Name: APPCRASH Application Name: CCleaner64.exe Application Version: 5.65.0.7632 Application Timestamp: 5e7256e6 Fault Module Name: ntdll.dll Fault Module Version: 6.1.7601.24545 Fault Module Timestamp: 5e0eb67f Exception Code: c0000005 Exception Offset: 0000000000027a6d OS Version: 6.1.7601.2.1.0.256.48 Locale ID: 1033 Additional Information 1: 3a84 Additional Information 2: 3a844e3fff63cca56b1e2588e17d8501 Additional Information 3: e5c9 Additional Information 4: e5c9ac4a741c114e4768ab3fc188762d I tried excluding it in 0patch. I tried making it an exception in Bitdefender. I tried disabling 0patch agent. I tried uninstalling and reinstalling CCleaner. None of these kept CCleaner from crashing. Later I uninstalled CCleaner Pro and installed an older version (5.61.7392 64-bit) of CCleaner free (the free version so I could prevent it from automatically updating itself). This version runs without crashing, with 0patch enabled and CCleaner not excluded.