Not enough memory

I had a nice digital camera that I was using whenever I went out with friends. I was uploading the pictures and videos in my computer, so I can watch them later. It was already taking most of my hard disk memory, and I didn't check on remaining available space. I took an excellent video today, and I went home and plugged in the camera to my PC. As I tried to upload the contents, a message popped up saying that there is not enough available memory on the hard drive. I deleted some old content I had, but I kept getting the same message. I found a video online that explained how to permanently delete files, and this solved my problem.