How can I get more free space on Local Disk C?

So basically, I have made a tribute on Windows Movie Maker, and I all I need to do is save the video so i can put it on youtube, otherwise you can't put it on and i really want to. To save the movie, I need at least 13.8 GB. I have 12GB and have deleted loads of files and folders but the space does not... show more So basically, I have made a tribute on Windows Movie Maker, and I all I need to do is save the video so i can put it on youtube, otherwise you can't put it on and i really want to. To save the movie, I need at least 13.8 GB. I have 12GB and have deleted loads of files and folders but the space does not increase. How or what can I do to increase the space on the local disk C? I don't want to buy anything as I am on a budget. Something that works and is free. Thanks!
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