Having trouble installing, telling me to close firefox, before instalations complete

after downloading new version, when I click run, then next, a message appears saying (Firefox must be closed to proceed with the installation. Please close firefox to continue.) & When I do, then the installation/setup stops too. Please help, I thank-u for your time.
Sincerely,
Darnell

If a reboot is needed then that usually means that some (security) software is blocking files.
Do a clean (re-)install:
* Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Do not remove personal data if you uninstall the current version.
* 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.
Your bookmarks and other profile data are stored elsewhere (not in the Firefox program 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.

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