Can't uninstall firefox beta release on Windows XP as you discribe

I can't uninstall Firefox 8 beta on my Windows XP as you describe. It appears "''Your computer must be restarted to complete a previous upgrade of Firefox. Do you want to reboot now?''" Rebooting does not solve the problem. When installing a new version the same message appears. When checking for updates appears "''Firefox is up to date''".
Please advice. Many thanks in advance.
[email protected]

I found the following on that error message here: http://kb.mozillazine.org/Browser_will_not_start_up#Computer_must_be_restarted_message_after_Firefox_upgrade
'''Computer must be restarted message after Firefox upgrade'''
If you see a message similar to ''Your computer must be restarted to complete a previous upgrade of Firefox'' after a major update (e.g., from Firefox 3.6 to 8.0) and restarting the computer doesn't help: On Windows, open the Mozilla Firefox installation directory (e.g., C:\Program Files\Mozilla Firefox or, on 64-bit Windows, C:\Program Files (x86)\Mozilla Firefox) and delete the file "firefox.exe.moz-upgrade". If you still can't start Firefox, do a clean reinstall (use another browser to download the Firefox installer from www.mozilla.org/firefox and, after first removing the Mozilla Firefox installation directory, reinstall Firefox).
The above refers to an error attempting to start Firefox but the same solution might work for errors when attempting to uninstall Firefox (delete the file '''firefox.exe.moz-upgrade''' from the folder where Firefox is installed, then run the uninstaller.) See also [[Uninstalling Firefox]].

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If i go to control panel or helper.exe i get this message:
"Your computer must be restarted to complete a previous upgrade from firefox. Do you want to restart now?"
picture: http://img17.imageshack.us/img17/1850/messagebi.png (It's dutch)
Even if i restart my computer then i still get the same message..
And if i want to install the newest firefox i also get that message.
I just want to re-install firefox because i can't upgrade.. So i just want a clean firefox again.

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Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that makes it possible to uninstall Firefox or remove the files.
*http://kb.mozillazine.org/Uninstalling_Firefox

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