For Tweaking.com - Windows Repair | Advanced Repairs (Pro) | Missing Package Files - Reg Cleanup at the end of the process on, I think it was called, the Administrative Screen, which I think was gray, and, it asked "Permanently delete the registry key, I think HKEY_LOCAL_MACHINE,\???????????\C ? Yes/No".
I apologize for not writing down at the time of exectuion the screen name, screen color and registry key.
I answered No and the process ended and my PC has run OK since then.
I do not remember getting asked this question previously when I ran Missing Package Files - Reg Cleanup.
Why is that question there?
What are the implications of answering Yes or No?