Hello, my name is Emmanuel, and I am an independent advisor. I'll be more than happy to assist you today!
I am so sorry to hear that you are having an issue with your C drive storage. Based on your screenshot, it seems like you are only checking the properties of a specific folder inside your C drive. I would suggest you open File Explorer, then click the THIS PC tab at the left side menu, then right-click the LOCAL DISK C folder, then select Properties > under the General tab. You should see both USED and FREE space on your C drive.
You may check the current usage on your C drive. Please right-click the Start menu icon, then select Settings > Systems > go to Storage and you should see a breakdown of how the storage on your drive C is being utilized. Please see the screenshot below for your guide.
I hope this information can help you.