Try this, go to C: drive and press Ctrl + A to select all files and folders. If you see a pop-up saying there are hidden files, even if you didn't, go to the folder options and select 'Show hidden files' and untick 'Hide system files'. Remember to hide them afterwards. If there happen to be hidden files, they might be the reason for the 'loss' of space.
Hidden files are files that are hidden (hence the name) and they could be located anywhere. On your C: drive, there should be a hidden system folder named 'Recycled'. That is where all your deleted files go to. Yes, they go there after you delete files, so empty your recycling bin as Jojoyee suggested to free more space. There's also a folder named 'System Volume Information' on C: drive that holds system restore files which can be pretty big. So clean it up until the recent restore points as wdhpr suggested. These files can easily escape your notice and these files might be your 50GB gap.
Hope this helps
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