Installed FF. 8.1 and after reboot, tryed to start FF and got message "Could not load XRE functions.

I have been running I believe FF 6.3. I was getting nag popups to update FF. I went to help and used the selection there to up date. In doing so (more than once tryed this method) it would download and install like a usual update untill compleation. Then it would say Could not compleat update or Could not restart firefox because and instance is running. Close FF and try again. But there was no visiable FF running not even in Device Manager.
I will mention here that I did install Skype last week and have seen a couple of messages concerning Skype not loading on start up but seeing it running in the tool bar if this may have anything to do with it.
So looking for help at the FF site I saw recomended to DownLoad and install FF 8.1 so I did that. Then from Control Panel I uninstalled FF and rebooted and installed fresh leaving the old settings and bookmarks etc. Then rebooted again.
When I started FF 8.1 I now get a message "Could not load XRE Functions".
So remembering the last progy install on this box was Skype I went to the control panel and un installed it ---- and when I did, at the finish I got that same message "Could not load XRE Functions".---- Intresting---- hummmm but how do I get FF installed so I can get on with Life?
I just tried to verify this new account and got the same Couldnt Load message when I clicked on the email link for this forum.
Much Thanks in advance for anyones help.

Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 8.0.x: http://www.mozilla.com/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.
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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