How can I stop Firefox 4.0 from preventing me from installing a Yahoo toolbar?

I have Windows 7. As soon as I download Firefox 4 I lost my Yahoo toolbar. When I try to reinstall it, I keep getting long error messages with lots of numbers that tell me that Firefox prevents the installation. I want my Yahoo toolbar. Clicking on and off the Yahoo toolbar in Tools does not work either.

It is possible that you are still on the beta update channel if you ever installed a Firefox 4 beta version or a release candidate.
You can check that by looking at the pref app.update.channel on the about:config page.
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website. 
If you see a warning then you can confirm that you want to access that page. 
You can use the Filter bar at to top of the about:config page to locate a pref more easily.
If the value of that pref is beta then it is better to download and install the latest Firefox 4.0.x release.
Download a new copy of the Firefox program and save the DMG file to the desktop
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Trash the current Firefox application to do a clean (re-)install
* Install the new version that you have downloaded
Your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks and other personal data.

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How can I stop Firefox 4.0 from preventing me from installing a Yahoo toolbar?

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