I can't update Fiefox since update 10.o1 or 10.02. Every time I try to I get the same message, "7 - ZIP File is missing" I don't know how or where to correct this problem. I'd really appreciate any help that corrects this problem.

Missing "7-Zip File"
Hello,
I haven't been able to update Firefox since 10.01 or 10.02 because every time I try I get the same message the "7-ZIP File" is missing. Then the update fails. I've submitted this problem to Mozilla Firefox and, got an immediate reply of " they are researching your problem".
Well, you can tell how long that has been. Is there anything I can do, or any where I can go to get the file I need?
Any constructive help would be very much appreciated! I'm not sure If I'll ever be able to find where this is located. But I do appreciate help just the same.
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It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox.<br />
Disable your anti-virus software temporarily to see if that makes installing work.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 11.0.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