Please don’t waste money on winzip.
First of all, 7-zip is free and is better than winzip in almost every way.
Secondly only text based files compress significantly.
Jpegs, audio and video files all can’t be compressed much at all as they are all compressed formats to start with. So you won’t save almost any space through zipping them.
I fully agree with SJSinNYC that an external hard drive is a much better eitzah for you here.