My instructions were for folder permissions within Mac OSX, but Aaron's advice was for windows. That's why you didn't understand my instructions. Which version of LW are you using?

You say you have lots of space, but do you mean on the partition you're saving your downlds to or your computer overall. For windows, it's very important to defragment frequently when you're constantly saving & resaving files to your hard disk drive. Also delete your Preview files from your incomplete folder (ie: everytime you preview a video or audio file, it leaves a preview file in the incomplete folder called PREVIEW-filename. For video files, this can take up considerable space.)

For windows issues I'm not the best one to ask.