Every time I try to install the latest version of Firefox I get a message saying to close all programs using it. I have removed it from my computer I think.

I Want to use Firefox, but if I can't get it to install it's no good to me.

Hi,
Please check if '''firefox.exe''' is present in the '''Processes''' tab of the '''Task Manager''' ('''Ctrl''' + '''Shift''' + '''Esc'''), right-click on it and '''End Process'''. If it is not present, you may have to delete the '''parent.lock''' file in the [http://kb.mozillazine.org/Profile_folder Firefox Profile Folder]. Type '''%appdata%''' in the Windows Start menu '''Run''' box and open the '''Mozilla''' folder.
You can also try to uninstall the previous version via Windows Control Panel > '''Add/Remove Programs''' and do a fresh install. Please do take a [https://support.mozilla.org/en-US/kb/Backing%20up%20your%20information?s=backup&r=1&e=sph&as=s backup] of the important data.
[http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Files]

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