Storage not adding up to files used

[Supernova_34]

I am trying to clear some storage on my computer but I am unable to find out where or how to clear it. On the generic Windows 10 Storage page, it states that I have used 913GB out of 914GB for "This PC". I ran two tests using WinDirStat and another tool. They both stated that for my entire computer I have used 123.5GB and for my"C drive 76.2 GB out of 76.4 GB. Help I am really confused on why Windows 10 states that I have 914 GB and my C drive is only 76.4 GB. (Note: Since the screen shots, I have remedied the files with the "date changed" that were in the future (2023). All my updates are up to date as of yesterday.

[Supernova_34 · Accepted solution]

SOLVED: Downloaded EaseUS Partition Software and lowered the partition size to a couple of GB higher than what the capacity was saying on the Windows program. After the reboot, I had over 800GB of unused storage. I then just expanded my C drive up to 900GB using the unused storage and it worked instantly! Now my C drive shows over 900GB of storage instead of the 74GB capacity.