I recently got a message on my computer saying "Your startup disk is almost full." Then it would say, I can't save this particular thing because there is not enough free space, or something of the like. I took a couple of hours one day and moved a TON of pictures off and put them on a flash drive and then deleted them all, and emptied my trash bin. I also deleted a TON of word docs and other things that were junk that I didn't need on my computer. Somehow, after doing all this, I have not freed up any space! It will not allow me to move any more pictures onto my computer from my camera, nor save a picture from the net, for example. I was told I can "Secure Empty Trash" (?) but it is greyed out and won't allow me to click it. How can I free up space?? Do I need to do a format of my computer or something?