Every time I use Disk Analyzer I’m asking for trouble. By that I mean, I loose things that I shouldn’t. For instance, when I restart the laptop I get a black page. totally BLACK!!! I thought I’d eliminate duplicate not critical files
There is no disc analyser in ccleaner 7.3 (latest) are you using an old version
You are using v7.1 which had the Duplicate Finder incorrectly called ‘DiskAnalyzer’ by mistake.
DO NOT simply used it and then ‘Batch Select’ and Delete every duplicate that it has found.
If you do that you WILL break your machine.
That’s because in CCleaner7 the Duplicatee finder has no filters and so by default it will find duplicate System (and application) files that are needed for your machine to work properly.
If you delete those then your machine stops working properly (or stops working at all).
If you have to use the Duplicate Finder in CCleaner 7 the be sure to unselect such files before deleting.
If you don’t know how to identify which are the system files and which are your own files thenyou are best to leave the Duplicate Finder alone.
If/when you have deleted the needed system file duplicates then you can try using DISM and SFC to repair the system.
If you can’t even get into Windows to run DISM/SFC then try the Windows Startup Repair tool: