Getting error message: couldn't load XRE function after upgrade to 9.0

please advise, I tried reinstalling already.

Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).
Avast may also be using some kind of virtualization that prevents files from getting updated, so you may have to check and disable that feature.
* http://www.avast.com/pr-avast-6-0-will-bring-automatic-virtualization-technology-to-all-free-users
Try to ask advice on the Avast forum if you're unsure about this.
* http://forum.avast.com/
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 9.0.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 in the profile folder.
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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    * Firefox 8.0.x: http://www.mozilla.com/en-US/firefox/all.html
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