I'm trying to sell some interior stuff here and every time I try to load photos my computer crashes. I don't think anyone wants to purchase things sight unseen so a little help here.
Pretty much infinite variables with what you have asked. Knowing nothing about what you have, I would ask if you are trying to load too large of pictures to the site.
Easist way is make a new folder put all your pics into the folder then send them to yourself windows will ask what size select default medium around 100k each once you have received save & upload if the file is too large ebodies will reject them