Is there a faster way to see what is taking so much space in my files?

[HG117]

I tried using Command Prompt, but it keeps telling me that the drive is locked. I need to know the fastest way because I'm having massive issues with this computer such as slowing down and laggy or most of the time being unresponsive , and I want to understand how my computer managed to store 736GB full of files. I don't have any games or videos, this is computre is used for work.

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