Problem messages when Firefox downloads update

Over the last couple of weeks I get the following sequence of events every few dats:
# A message from Norton Internet Security that updater. exe is safe
# A message that an unknown publisher updater. exe. is attempting to access my computer. I click on allow the program
# A message from Firefox that I should apply the updates as soon as possible. I click on more information
* A software update window that shows "connecting to update server" But it never connects, even if I leave the window open for hours.
# Firefox opens but there is no message saying updates were successfully installed.
If I go to About Firefox:
* It checks for and downloads updates . The Apply button appears
# I click on apply and the same sequence of events as above occur
According to About Firefox I currently have Firefox 4,0, Yahoo edition 1.8. I have Windows Vista.

If Firefox gave you the following error message:
Firefox could not install the file at
https://addons.mozilla.org/******.xpi
because: <br /> Invalid file hash (possible download corruption)
-261
This error message may be caused when Firefox is set disallow third party cookies.
To accept the third party cookies:
go to Tools -> Options -> Privacy -> tick 'Accept third party cookies'.

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