CCleaner 5.88 is ancient, (an so is Win 10 1703).
I suggest that you at least get CCleaner v6.39.
Follow the instructions here - particularly the one about turning off automatic updates in v6.39:
How to Roll Back from v7 to v6.39
PS. I would also suggest getting your Windows 10 up to date, version 22H2, while you still can.
Or getting Windows 11.