It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox. Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.

See "Disable virus scanning in Firefox preferences - Windows"

• http://kb.mozillazine.org/Unable_to_save_or_download_files

If there are problems with updating then best is to download the full version and uninstall the currently installed version and delete the Firefox program folder to remove any leftover files.

Download a fresh Firefox copy and save the file to the desktop.

• Firefox 12.0.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 your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.

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

I have disabled the virus scan and all. It isn't the download that says is corrupt it is when trying to install.

-> Uninstall your current Firefox as described in this article -> Uninstall Firefox from your computer

• DO NOT SELECT TO REMOVE USER DATA AND SETTINGS
• Restart your system

-> Download latest Firefox 12 from the following link using some other Web Browser:

• http://www.mozilla.com/en-US/firefox/new/

-> Install Firefox as described in this article -> How to install Firefox on Windows

Check and tell if its working.

No Go! SEE... No what? Do Mozzilla staff look here any?

Delete all earlier downloaded Firefox setup files. Re-Download Firefox 12 setup (DON'T RUN THE SETUP YET)

After your download of Firefox 12 is complete, Restart your Windows in Safe Mode

• http://windows.microsoft.com/en-us/windows-vista/start-your-computer-in-safe-mode

Now try to install Firefox using the setup file you downloaded before restarting your system.

Check and tell if its working.

Tried that one as well already. Next idea?

Was it showing the same error message even when running your Windows Vista in Safe Mode  ??

yes same error message

1. Are you able to download any other file from some other website ??
2. Are you able to open the downloaded file ??

OR is it displaying the same error message on any file that you try to open after downloading them ??

Where else besides direct from moz can I get the file and it downloads fine but when trying to open/install I get that error.

What i meant to say is Download some other file like a photo (image file), song (mp3 audio file), a document (Adobe pdf file or MS Word file), etc...

1. Do they open correctly after downloading ??
2. OR are they also showing the same error message when you try to open them after downloading ??

yes all downloads correctly and but only error I get is when trying to open and install the ff and I get that message about 1 min into install

Ok, try redownloading again, this time use Internet Explorer. Save the file to your desktop (don't click run). Make sure Firefox is closed. Once it is downloaded, double-click it, and try running it again. Do you have enough free space on your computer?

It also looks like you've got AVG and spybot search and destroy (you really only need anti-virus like AVG). If you kill them both does it work? Also make sure you apply any updates to windows before this and restart.

Perform the suggestions mentioned in the following articles:

• Run as Administrator

-> Software Update not working properly

• http://kb.mozillazine.org/Software_Update#Software_Update_not_working_properly

Check and tell if its working.

That error still means that something went wrong when downloading and saving the file to your computer, so you need to try again.

You can find the latest Firefox release in all languages and for all Operating Systems here:

• Firefox 12.0.x: http://www.mozilla.org/en-US/firefox/all.html

don't work with them off either.

Which security software (firewall, anti-virus) do you have?

There are other things that need your attention.

I notice that your plugins list shows that the Mozilla ActiveX plugin is installed.

• Mozilla ActiveX control and plugin module

The Mozilla ActiveX plugin is not compatible with Firefox 2 versions and later and you should remove it.

For instructions on how to remove the Mozilla ActiveX plugin see:

• http://kb.mozillazine.org/ActiveX

well I guess I'll try to install it again next time I manage to get to internet in a few monthes as my time is almost up here.... Thanks to everyone who tried helpping today. I'll recheck this post when I get on again.

I tried a few times till I got a different mirror than I had been using and have firefox working with no trouble now. Thanks for helping.