Firefox will not open unless I delete it and download again.

Firefox is set as my default browser. Something has happened recently that caused this. I have both I.E. and Torch which both open fine. When I try to open Firefox, nothing happens. Pressing Ctrl,Alt,Del shows nothing in the "task" box. When I click "New Task" and enter Firefox, nothing happens. The only way it will open is for me to delete the program, restart and download it new. It will open after the download, but if I close it, it will not reopen.

Hello,
Try to create a new profile to see if it works or not.
https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

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