The last couple of times I’ve updated Mozilla Thunderbird through the automated update, the upgrade process would get stuck somehow. I would go to open Thunderbird, and an error would popup that said:
“One or more files could not be updated. Please make sure all other applications are closed and that you have permission to modify files, and the restart Thunderbird to try again”
I would click ok, it would try to update, fail, and come back with the error message, going into an endless loop. In the past, I did a full uninstall and reinstall to get rid of the error message. This time that didn’t work. I did a little research, and found that a couple files in a particular directory weren’t getting updated, causing Thunderbird to keep thinking it needed to upgrade.
To fix the issue, without having to do a reinstall, delete everything inside this directory:
C:/Documents and Settings/<username>/Local Settings/Application Data/Thunderbird/Mozilla Thunderbird/
End of loop.
Update: Be sure to check the comments for alternative solutions.
Update II: As many of the comments point out, the primary culprit of this issue may actually be Logitech with their QuickCam software. I have a Logitech webcam as well, so that fits my scenario. I’ve had a couple run-ins with Logitech now that make me wonder if they are headed down the same path as Creative.
Update III: marcelotroubledwiththunderbird notes he had the upgrade loop issues and did not have QuickCam installed.