Fresh install won't start - says it's already running even after reboot

I've installed Firefox for the first time on this Windows 2008 machine.
The installer quit complaining that Firefox was already in use. I've rebooted twice, and attempted to delete the parent.lock file, and it still won't open.
I can't delete the parent.lock file as it's in use, even after a reboot.
Anyone got any ideas how I fix this?

edit
I missed the post above. Partly no doubt the annoying lag on forum listings updates.
Is the entry in the ''profiles.ini'' file sane and does it point at a location that has suitable read and write permissions. I am of course assuming if you rename ''profiles.ini'' in its current location that Firefox does recreate it.
* http://kb.mozillazine.org/Profiles.ini_file
Presumably after you delete or rename the profile folder Firefox does manage to recreate and populate the profile.
If this is not happening do a clean reinstall of Firefox again, deleting all the Firefox program folders and files prior to the install.
*[[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox]]_5-reinstall-firefox

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After I turn on my laptop and click on firefox it works fine and it opens THE FIRST TIME. So can you help? i DON'T WANT TO RESTaRT my computer everytime and sometimes have to clsoe firefox b/c I'm typing paper and computer goes slow.

Sounds like a "hang at exit" problem. There are several possible causes for that error. See:
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** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
* What may cause Firefox to hang at exit
** http://support.mozilla.com/en-US/kb/Firefox+hangs (see "Hang at exit" section)
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: http://support.mozilla.com/en-US/kb/Safe+Mode
**Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling '''one at a time''' until the problem reappears. '''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.
** See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting

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~Jer

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http://support.mozilla.com/en-US/kb/Firefox+hangs
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macbookpro2011ISU wrote:
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What is the computer system and Firefox on the bad computer?
Separate Issue;
Your System Details on this computer shows;
Multiple versions of your Adobe programs.
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Go to '''adobe.com''' and download the full installers after removing
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'''https://support.mozilla.org/questions/997866''' {web link}

Fresh install won't start - says it's already running even after reboot

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