IE on a pc is breaking my design

I just built this site and it works everywhere, except on IE on pc. Even
IE on mac is doing fine. IE on pc seems to be making some divs wider, so
instead of being in one line, they break to two. What could be causing this?

The pages are here:
http://www.bronzesf.com/test
http://www.bronzesf.com/test/portfolio.html

CSS is here:
http://www.bronzesf.com/test/css/bronze_style.css


I am using the following css for the areas that I think are causing this
issue:
* {
margin: 0;
padding: 0;
border: 0;
}
.textholder {
float: left;
width: 140px;
text-align: right;
margin: 45px 8px 0 12px;
}
.pieceholder, .pieceholder2 {
float: left;
width: 700px;
background: #fff url(../img/general/bg_02.jpg);
margin: 45px 0 0 0;
}



What am I missing, what is causing this.

Thank you for any suggestions with this!