Loss of disk space despite clean install

On it. I'll be back.

I checked the BIOS settings in setup. I could not find any Secure Boot.

Looking in system info it says "Secure Boot state is not supported"

Augi1 said:

I checked the BIOS settings in setup. I could not find any Secure Boot.

In the BIOS, is there a way to toggle from Legacy to UEFI ?
If yes, then toggle it to UEFI then see if Secure Boot shows up.

And the BIOS mode is Legacy, not UEFI. Again, would it be easier/possible to convert to UEFI? I saw a tutorial on this, but I am not sure how to tell if my motherboard will support UEFI. I'll be back in a few. Time for a beer.

Before you do anything else can you download the free version of Mini Tool, install it and post
screen shots of what it shows ?
This tool will show all the partitions you have,
even the hidden ones which windows disk manager won't show.
Best Free Partition Manager for Windows | MiniTool Partition Free

I used the MiniTool and found there are LOTS of files that are all exactly 200 MB. Probably a couple hundred of them all told. They could easily be eating up my hard drive. I've included the screen shot of the drive itself and one of a few of the 200 MB files. Still, this doesn't solve my problem of wanting to do a clean reinstall of W10. Are there any other views you want to see through MiniTool?

simrick said:

Fast Startup?

He could physically disconnect the OS drive, boot from disk, then connect the drive back to do the clean install.

Would the UEFI structure work given that I have a Legacy BIOS?