Here is the link to the Sammobile Firmwares page that John is talking about. http://www.sammobile.com/firmwares/
Ensure that you search by your model number.
Also, try this:
- Restart phone
- on the lock screen, instead of swiping and getting stuck in "installing applications", just drop down notifications
- on notifications menu, tap where it should say "low on disk space". It will open "Applications" from the setting menu.
- Uninstall some apps until you get around "250MB" from the 2GB reserved by the system (250MB was what worked for me, that's the reason of the number; I had lower than 200MB before). I tried to move apps to SD Card to no avail, that's why I uninstalled the apps.
If you have locked your phone with a pattern, when you unlock it, it will send you direct to "installing app...". Run the Task manager and from it drop down notifications then follow the rest.
Hopefully one of these answers will solve the problem!