Well, firstly, you shouldn't have HTML elements with the same ID. That will cause problems. Secondly, I would recommend using the .attr() (attribute) method instead of .prop().
I amended your code with these changes and it is working, although you might want to review your approach and have only one copy of each button on the page, or, if you want to have them repeated for each div, then set their attributes as fixed, as they never appear to change.
I have included your code with these modifactions below, but I have also forked your JSFiddle with the changes. You can check it out here: http://jsfiddle.net/QTMR5/1/.
<a href="javascript:void(0)" class="show-page one" data-page="first">First</a>
<a href="javascript:void(0)" class="show-page two" data-page="second">Second</button>
<a href="javascript:void(0)" class="show-page three" data-page="third">Third</a>
<div class="container">
<div class="page first">
<div class="row">
<center>
First Page<br />
<button class="btnd btnd-default" id="firstone">Personal Info</button> <br />
<button class="btnd btnd-default" id="firsttwo">Educational Info</button> <br />
<button class="btnd btnd-default" id="firstthree">Employment Info</button>
</center>
</div>
</div>
<div class="page second hide">
<div class="row">
<center>
Second Page <br />
<button class="btnd btnd-default" id="secondone">Personal Info</button> <br />
<button class="btnd btnd-default" id="secondtwo">Educational Info</button> <br />
<button class="btnd btnd-default" id="secondthree">Employment Info</button>
</center>
</div>
</div>
<div class="page third hide">
<div class="row">
<center>
Third Page <br />
<button class="btnd btnd-default" id="thirdone">Personal Info</button> <br />
<button class="btnd btnd-default" id="thirdtwo">Educational Info</button> <br />
<button class="btnd btnd-default" id="thirdthree">Employment Info</button>
</center>
</div>
</div>
$(document).ready(function () {
$('#firstone').attr("disabled", false);
$('#firsttwo').attr('disabled', true);
$('#firstthree').attr('disabled', true);
$('.one').click(function(){
$('#firstone').attr('disabled', false);
$('#firsttwo').attr('disabled', true);
$('#firstthree').attr('disabled', true);
});
$('.two').click(function(){
$('#secondone').attr('disabled', false);
$('#secondtwo').attr('disabled', false);
$('#secondthree').attr('disabled', true);
});
$('.three').click(function(){
$('#thirdone').attr('disabled', false);
$('#thirdtwo').attr('disabled', false);
$('#thirdthree').attr('disabled', false);
});
var value = 0, progress;
function progressBar() {
progress = setInterval(function () {
var $bar = $('.bar');
if (value >= 100) {
clearInterval(progress);
$('.progress').removeClass('active');
$(".show-page[data-page=Profile]").trigger("click");
} else {
value += 10;
$bar.width(value * 7);
}
$bar.text(value + "%");
}, 800);
};
$(document).ready(function () {
if (typeof (Storage) !== "undefined" && localStorage.getItem('pageToShow')) {
var pageToShow = localStorage.getItem('pageToShow');
$('.page').addClass('hide');
$('.' + pageToShow).removeClass('hide');
};
$('.show-page').click(function () {
var pageToShow = $(this).data('page');
if (pageToShow == "progBar") {
value = 0;
$('.bar').width(0);
$('.progress').addClass('active');
progressBar();
} else {
clearInterval(progress);
};
$('.page').addClass('hide');
$('.' + pageToShow).removeClass('hide');
if (typeof (Storage) !== "undefined") {
localStorage.setItem('pageToShow', pageToShow);
};
});
});
});