I updated to Firefox 4 and ever since it won't open. It says the process is running but no matter how long I wait it won't open the browser and restarting or ending the process and trying again doesn't work either. Is there any way to fix this?

I thought it might be a compatibility issue with Windows Vista but the same problem happened on a computer with Windows 7. I'm not sure if the Windows 7 problem was resolved, though.

You probably have other problems but for a start right click on your task bar and click on Start Task Manager. In "Applications" if Firefox is shown, click on "End Task". In "Processes" if Firefox.exe is shown, click on "End Process" and ignore the warning and click"End Process" again. Wait for a few seconds then start Firefox in the usual way. There is a chance that this may solve your problems.
If not, you probably will need to do a complete uninstall and re-install. If you can't start Firefox you could try starting in Safe Mode - Hold down Shift key as you double click on the Firefox icon>ignore the page that opens>and Continue. If you've been able to open Firefox you could work through this Troubleshooting Procedure -
https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes
If at any stage you are not making progress, report back here for best advice on an Uninstall/Re-install which is quite likely to be necessary.

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