I'm using firefox on vista. Whenever i try to download something, I click save file on the box that pops up, then it shows up in the firefox download box, but instead of downloading anything, it immediately says canceled. I can click the refresh button, and it starts and finishes, but when i double click on it, nothing comes up. I go into my downloads folder and attempt to open it, but a norton error message comes up saying that my internet security settings prevented one or more files from being opened. I've completely turned off norton as well as all internet security, but the download still won't work. What do i do?