I Have been using FF but now it won't open.

I can no longer open Firefox. I have tried the following solutions with no luck:
I tried to uninstall Firefox so I can reinstall FF and I got this message:
"FF must be closed to proceed with the uninstall"
"Please close FF to continue"
I tried to download a new FF install. When I got to the Mozilla setup wizard and chose standard install I got this message:
"FF must be closed to proceed with the installation"
"Please close FF to continue"
I have also gone into task manager and closed the open FF processes and restarted the computer. I still could not open FF.
I have also tried opening the profile folder and deleting the "parent.lock" file, per a previous suggestion I received.
I need help.

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps to uninstall Firefox.
You can also remove the Firefox program folder manually on disk.
*(32 bit Windows) C:\Program Files\Mozilla Firefox\
*(64 bit Windows) C:\Program Files (x86)\Mozilla Firefox\
*http://kb.mozillazine.org/Uninstalling_Firefox
See also:
*http://kb.mozillazine.org/Browser_will_not_start_up
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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I Have been using FF but now it won't open.

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