DownloadOK,installingOK, rebooting has no effect and a request for it keeps reacurring, no way to open Firefox?

Question

I've downloaded Firefox version 9.While running setup a request for rebooting was observed. After having finished the setup another reboot followed, thereafter an "Unpack" icon appeared in the taskbar. Upon pressing it I was requested to reboot again ... and again, and again... . The same request came up whether I push the "Unpack- icon" on the desk top, or start menu. I cannot find a way to finish the installation, nor to uninstall the newly obtained upgrade. Neither I was able to open any version of the Firefox application. Also all tries to installed ver. 9 over the existing (previous or newly upgraded) versions fail.
I am using Windows 7 Ultimate 64 bits with ample reserves of memory.

Answer 1

Found a working around to the problem. After updating from version 8.0.1, it keep bugging me to rebut, to no use what so ever. Here a solution I found:
1. To those in need to save their bookmarks, password saved, etc, you need first of all to save your profile folder, witch can be found on Windows 7 on the location
C:\Users\user name\AppData\Roaming\Mozilla\Firefox\Profiles
Copy the hole directory Profiles to what ever location to keep safe.
Those ho have no need to backup, skip this steep.
2. Manual delete the whole directories:
C:\Users\user name\AppData\Roaming\Mozilla
and
C:\Users\user name\AppData\Local\Mozilla
3. If still have links in Start Menu please delete them (mine has gone away when I try to update to 9 version)
4. Go to Control Panel / Programs and Features and click uninstall Mozilla Firefox, a small message will ask you if you want to remove the link because the program cant be found, click yes.
5. Download and install Firefox 9 from Mozilla.org using Internet Explorer or other browser of your choice (Chrome, Opera, etc)
6. In order to have your data back, copy the content of the Profile folder over the new installment, but be careful to copy only the content, because the name of the folder that literally contain the Profile data, is every time another, by example:
original mozilla 8 was 9um78jwe.default and the new one is skfwyddf.default
so copy only the content to another, meaning the directories
bookmarkbackups
chrome
extensions
icons
minidumps
weave
and off course all the other files.
When asked to overwriting say yes.
This is it, you can now start your new mozilla 9 installment.
Good luck.