1.) Visit http://www.mozilla.com and download the latest version of Firefox.
2.) Close Firefox and launch the installer.
3.) Choose to install Firefox to the same location as it is currently installed.
4.) When prompted, choose to replace the existing installation.
That should work around the faulty automatic update.
Hope this helps,
The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again.
hi above is error message i get when fire fox trys to up date i am using windows vita home premium