I downloaded a security update & when i tried to open firefox afterwards ,I couldn't open it. have a DEP settings problem i tried to change my computer's DEP settings but was notified i couldnt for firefox,what should I do?

I was prompted to downloaded a security update & so I did. when i tried to open firefox afterwards ,I couldn’t open it. My computer told me I had a DEP settings problem.I tried to change my computer's DEP settings but was notified i couldn't for firefox. I tried the uninstall & then install Firefox again route (could not even do it in safe mode since i can't even open firefox)but still had the same problem afterwards. What should I do?

Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 10.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible.
*Do NOT remove personal data when you uninstall the current version or you lose your bookmarks and other data because all profile folders will be removed.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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