Trying to upgrade to V.8, cannot open Firefox. Have uninstalled, loaded 8 again then 7 , 9 and finally 6. The program will not run. Operating Windows 7. When I try to uninstall, I am asked to 'close Firefox' but it isn't open ( Task Manager confirms).

Firefox 8 won't open. The Windows 'wheel' which indicates a program is opening spins for about 5 seconds and then stops and nothing happens. I have spent several hours uninstalling and then loading different versions but still the same thing happens. I frequently switch off and restart the computer but nothing happens. I have changed the Windows firewall to allow Firefox, again nothing happens.

In the task manager, are you looking at Processes? That is where you find Firefox listed when you see no interface, not in Applications.
This page might have some useful information about that problem.
* http://kb.mozillazine.org/Profile_in_use

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