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Using Windows XT and running FF 4.0 (Yahoo Edition 1.8), I am asked to download "the update", but the "application" never seems to take. Is something blocking it?

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After the download, the application screen just shows the "green worm" running across the top for many minutes until I either "hide" it or X it out.

After the download, the application screen just shows the "green worm" running across the top for many minutes until I either "hide" it or X it out.

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There is a 4.0.1 update for Firefox 4.0. I don't know why automatic update isn't working for you, but you could try these troubleshooting articles and cor-el's post in the earlier thread:

Software Update Failed | Troubleshooting | Firefox Help

Software Update - MozillaZine Knowledge Base

Firefox is unable to "update" when an automatic message arrives. I've uninstalled & reinstalled Mozilla. Still, no ability to update. | Firefox Support Forum | Firefox Help

Any luck?