Upgraded to firefox4, but it will not install the upgrade. Have restarted firefox many times.

when I open Firefox and it asks if i want it for my default and i say yes, it tells me I must restart to install previous upgrade. Have done this many times. I have also tried to uninstall Firefox and it won't let me.

You seem to be using the latest Firefox 4.0.1 version
*Mozilla/5.0 (Windows NT 6.0; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
Run the Firefox program once as Administrator (right-click: Run as Administrator).
See also:
* http://kb.mozillazine.org/Software_Update (Software Update not working properly)
Remove the files in the updates and updates\0 folder.<br />
You may need to delete active-update.xml and updates.xml as well if present.
Vista:
C:\Users\&lt;user&gt;\AppData\Local\Mozilla\Firefox\Mozilla Firefox\updates
(%LOCALAPPDATA%\Mozilla\Firefox\Mozilla Firefox)

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