You've somehow activated Talkback. If you have Lighflow installed and are using the stock Touchwiz Launcher, that's likely the reason. LF and TW don't get along. To start, uninstall Lightflow, but that might not eliminate the problem.
Talkback is hard to turn off, because it affects how the system responds to touches. A single tap just reads what it is you're tapping on. To actually tap a button, you need to wait until the phone shuts up, then single tap it to set the focus, and then double tap the button or item you want to tap. In order to scroll a screen, you need to use two fingers. So, using double taps and two finger scrolls, and lots of patience, navigate to Settings / Accessibility and turn Talkback off.
If Lightflow was the trigger, and you want to keep using it, try using an alternate launcher. I like Nova better than TW in most respects anyway.
Edit: corrected the post above (with the text in red) to correct an omission.