I can't install Firefox 5. It downloads & starts the wizard. I follow the prompts till it says it needs to restart the computer 'to complete a previous upgrade of firefox' . I say yes and it restarts and there is no sign of firefox and no error message.

The very first time I tried this there was a red message that flashed on the screen too fast to read it. I have Windows 7 and AVG. My son's computer also has Windows 7 and AVG and his upgrade went without a hitch. It deleted my old version of firefox (3.6.12) so now I'm using IE. Windows installed a lot of updates just before I tried upgrading firefox. I have tried turning my firewall down. I have gone to the file in downloads and double clicked it and it does the same thing. It always says it needs to restart the computer even though I have closed all other applications. Should I just give up and try reinstalling an older version of Firefox? Thanks

It is probably because you are not properly closing Firefox. Restarting your system would make sure that Firefox had terminated, but you do not have to do that.
To properly close Firefox on Windows systems, use
:File > Exit or "Firefox:" button > Exit
When you get the message "Firefox is already running" it is too late, and you must force termination of Firefox through the Windows Task Manager before restarting Firefox. Windows 7 has a keyboard shortcut to save you a step "Ctrl+Shift+Esc" then on "Processes" tab, select "firefox.exe" and use the "End Process" button. More thorough would be to right-click on the "firefox.exec" and choose "End Process Tree".
You would find firefox.exe in a Mozilla folder in your program files, but y0u would not want to delete it there, you would need to use the Control Panel which you have already identified and do it from there -- but generally you would not need to do that, and there is nothing in what you have posted to indicate that you should. But if you did do that, then don't let the install start Firefox for you as you would want to use you existing desktop icon or method of starting Firefox, and should decline having Firefox install start Firefox for you. When the install starts then invoke Firefox in your normal manner. This should eliminate problems of creating a new profile rather than using your old profile.

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    * Trash the current Firefox application to do a clean (re-)install.
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