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What do I do when I go to download the new version after deleting the old version and it keeps telling me to restart my computer but when I do it still won't install the new version?

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My son installed a toolbar and I uninstalled it but it didn't disappear. A friend told me if I uninstall firefox and re install it, that the toolbar would be gone. I uninstalled firefox and went to reinstall it and it told me I had to restart to get rid of the old version completely, I restarted my computer and tried to install it again and it keeps coming up with the "you must restart your computer" thing. I have restarted my computer at least 20 times and it keeps happening and I cannot install firefox and its making me mad cause I hate using IE but if I can't figure it out I am going to be forced to use it instead of Firefox :(

My son installed a toolbar and I uninstalled it but it didn't disappear. A friend told me if I uninstall firefox and re install it, that the toolbar would be gone. I uninstalled firefox and went to reinstall it and it told me I had to restart to get rid of the old version completely, I restarted my computer and tried to install it again and it keeps coming up with the "you must restart your computer" thing. I have restarted my computer at least 20 times and it keeps happening and I cannot install firefox and its making me mad cause I hate using IE but if I can't figure it out I am going to be forced to use it instead of Firefox :(

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If the toolbar installed something into the rest of the system, you will see an entry in the Control Panel in the software uninstall applet which should be removed. You might need to make a new profile if you cannot find an extension that has something to do with the toolbar.

http://kb.mozillazine.org/Uninstalling_toolbars