1
Please provide a screenshot of the error you see in Windows updates, so I can see which update cannot be installed and the indicated error and which partition the problem is indicated on.
2
Download the free TreeSize app from the Microsoft Store.
Very Important - to run TreeSize, you must right click its icon and choose Run as Administrator.
Please provide a screenshot of your C drive in that TreeSize utility, so I can see your hard drive and work out where that space is being used and if there is an underlying problem.
Please ensure the full TreeSize window is in the screenshot, there is information on the top and bottom bars I needs to see.