Firefox version15 will not work windows 7

My Firefox automatically updated to the latest version and then wouldn't work. I can see It starts with task manager but it just disappears. There are no crash dialogue box or reasons given for failure to start. safety mode produces a dialogue box which also disappears seconds after it appears.I have 2 other computers running vista a 32 bit and a 64 bit and no problems with the upgrade. I have tried turning off firewalls etc and deleted all my personal settings but still no joy

I have disabled the firewalls etc. I have allowed the firefox.exe file in the firewall. At this stage I was getting a window saying firefox is not responding so I uninstalled and reinstalled and now am getting nothing again. In task manager I can see it start but then it disappears with no explanation. I can get it to work if I install an earlier version but I cannot go past version 12

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Perfect! This works!!! Mozilla... remember many Mac users keep machines a looooong time! They are like an old Mercedes. They never die.

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*http://kb.mozillazine.org/Uninstalling_Firefox
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*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
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OH!! I forgot to post on here how I fixed this!! I searched for the solution on YouTube. Here's how to fix it!!!
http://www.youtube.com/watch?v=aHuYmhY-5-g
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Firefox version15 will not work windows 7

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