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When I download a file, it downloads 5-20%, and says it's done, and when I open the file, the other 80-95% is missing, and the application crashes

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This is getting to be RIDICULOUS. I'm using Mozilla FireFox 27.0.1 for Windows 7, and when I try to download ANY file, it starts downloading as usual, but one second later, no matter what the file size is, it says it finished downloading every megabyte of the file, but when I open it, I only see a small part of what's supposed to be there, and the application I used to open the file with crashes! HELP!!!

This is getting to be RIDICULOUS. I'm using Mozilla FireFox 27.0.1 for Windows 7, and when I try to download ANY file, it starts downloading as usual, but one second later, no matter what the file size is, it says it finished downloading every megabyte of the file, but when I open it, I only see a small part of what's supposed to be there, and the application I used to open the file with crashes! HELP!!!

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Could you try to disable the download scanning to see if Mcafee is a problem.

In order to fix the problem, try disabling the scanning as follows:

  1. In the Location bar, type about:config and press Enter. The about:config "This might void your warranty!" warning page may appear.
  2. Click I'll be careful, I promise!, to continue to the about:config page. A list of settings should appear
  3. Filter the list by typing in the search bar at the top. Type in scanWhenDone. You should now find the browser.download.manager.scanWhenDone preference.
  4. Double-click on that preference to set the value to false.
  5. Next, try to download something and see if it still hangs.

Please reply and tell us whether this helped you!