If it's still stock return it if nothing else works.
Have you tried going into safe mode? (I'm not sure which buttons put it into that mode, check your paperwork or look online, but that will let it boot with minimal apps starting.)
Example; You can boot into safe mode for some phones by powering up and when you see the screen graphic repeatedly press the menu button quickly until you see the home screen. You WILL lose icons by going into safe mode, in particular any homescreen widgets, which seems like what you want to disable remove the offending app.
Have you rooted this and/or flashed a new ROM on it or did it come with this application installed? (I thought it was shipped with v4.1 but an upgrade might be out?)
Failing the above you can try and do a factory restore, again check your paperwork for instructions, but you will have to re-enter all your personal info again and you will lose everything you entered/changed. (If you return it this will be the first step they do anyway and I'd rather whipe it myself then let "someone" have the opertunity to copy my data.)
Best of luck,