Firefox will not start - already tried all suggestions from troubleshooting

I searched google and here a couple times before posting this. My problem is simple, firefox just will not start. I can click on the shortcut, or the icon inside the c/program files/mozilla folder, i can click "run as administrator", i can do run/firefox.exe, and I can do all of these in safe mode, and still none of them work.
For each time that I do try to start it, it will be running in processes so sometimes I'll have 3 or 4 firefox.exe running but it is not actually showing up anywhere.
I already tried going to run/firefox.exe -p to create a new profile and that doesnt work either, because when I do it, nothing happens. I enter firefox.exe -p in the run command box, click enter, and.....nothing , not even the hourglass. I have tried doing it in regular and safe mode also. nothing.
I also tried uninstalling and reinstalling back when this first started happening, it was the first thing I did but no luck.
Also, one thing : 99% of the time nothing at all happens when i try to run firefox. When my computer is in safe mode though, and only if I click "run as administrator" on the firefox icon that is in the program files/mozilla folder, it says "a device attached to the system is not functioning." Thats the only time I ever got a error message though, every other time, and if I click on the shortcut or the start menu icon, nothing will happen, and if i do it outside of safe mode. The only time I get this message is in safe mode and when i click on the icon in the program files mozilla folder.
I read through the troubleshooting article on here and couldnt find any help, so I am hoping someone here can help me out since i f'ing HATE internet explorer, and safari is OK but I prefer firefox, and now safari is starting to give me trouble too so I would really just love to get back with my firefox. hope you can help me. thanks.

you don't think I already tried that?

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Firefox will not start - already tried all suggestions from troubleshooting

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