I've been using Firefox for a long time but I have a problem with upgrading process now. As you know, Firefox automatically checks for the latest version and downloads it, and when it is ready to be installed it starts the installation process as usual. Last month, when I clicked on "OK, install v3.6.2", the process started but couldn't be finished properly. FF gave a message like that: "Installation cannot be completed, please restart Firefox to retry". When I restarted FF, the same thing happened, and the process entered in an infinite loop. I restarted my PC and clicked on FF icon, and again the installation process began and went into the infinite loop.

My solution to this problem was to download FF 3.6.2 and manually install it after killing firefox.exe.

Today, FF proposed me to install v3.6.3 and again the same problem occured. I manually downloaded FF 3.6.3 and installed it successfully.

Anyone experiencing this problem? In case you want to know, I did not install any new addons in the last few months, and my FF operates without problems. I'm using Windows 7 Home Pro x64.