I have attached a link to a Zip file,download the file and put that on external sd card using card reader and then flash it via your recovery. Another recovery appears, then in that recovery, Click on reboot system now. hope this works, if it doesn't, I am afraid you will have to go the hard way and flash stock ROM via odin. don't worry, flashing stock ROM won't erase ur files or Settings.
link to .Zip file: