Am I cooked?

Hey everyone, I messed up big time and need some urgent advice.

I was trying to free up space on my main drive, so I copied and pasted everything from my C: drive over to my D: drive. Once the transfer finished, I went back to the C: drive, selected everything, and hit delete.

Now, things are completely broken. Now I wanted to reset my laptop and I couldn't— cause of games I installed from steam that I can't delete because it doesn't exist in the C: drive. I thought copying the files would mean I’d have a perfect backup, but I realize now that deleting system files on C: was a mistake.