Spry drop down formatting won't work in IE

Question

I've tried the other fixes mentioned on this forum- nothing worked.
It looks correct in Mozilla (although the background color doesn't go all the way across the submenu buttons) but in IE instead of displaying vertically, the menu stretches out horizontally.  I am redoing the menu and had it perfect the last time, and haven't changed a thing- I think there must be a problem with my tags because the code looks fine.  Any thoughts?? Help is much appreciated!
ul id="MenuBar1" class="MenuBarHorizontal">
  <li><a href="index.html">Home</a>    </li>
  <li><a href="about.html" class="MenuBarItemSubmenu">About Us</a>
    <ul>
      <li><a href="history.html">History</a></li>
      <li><a href="mission.html">Mission</a></li>
</ul>
  </li>
  <li><a class="MenuBarItemSubmenu" href="#">Products</a>
    <ul>
      <li><a class="MenuBarItemSubmenu" href="#">MIM 3000</a>
        <ul>
          <li><a href="highlights.html">Highlights</a></li>
          <li><a href="Features.html">Features</a></li>
        </ul>
      </li>
</ul>
  </li>
  <li><a href="#" class="MenuBarItemSubmenu">DSH</a>
    <ul>
      <li><a href="dsh.html">About</a></li>
      <li><a href="dshcontact.html">Contact</a></li>
    </ul>
  </li>
  <li><a href="brochures.html">Brochures</a></li>
  <li><a href="contact.html">Contact Us</a></li>
</ul>
and the CSS:
@charset "UTF-8";
/* SpryMenuBarHorizontal.css - version 0.6 - Spry Pre-Release 1.6.1 */
/* Copyright (c) 2006. Adobe Systems Incorporated. All rights reserved. */
LAYOUT INFORMATION: describes box model, positioning, z-order
/* The outermost container of the Menu Bar, an auto width box with no margin or padding */
ul.MenuBarHorizontal
margin: 0;
padding: 0;
list-style-type: none;
font-size: 100%;
cursor: default;
width: 589px;
background-color: #20a6e0;
float: right;
position: absolute;
left: 451px;
top: 156px;
text-align: center;
font-family: Verdana, Geneva, sans-serif;
/* Set the active Menu Bar with this class, currently setting z-index to accomodate IE rendering bug: http://therealcrisp.xs4all.nl/meuk/IE-zindexbug.html */
ul.MenuBarActive
z-index: 1000;
/* Menu item containers, position children relative to this container and are a fixed width */
ul.MenuBarHorizontal li
margin: 0;
padding: 0;
list-style-type: none;
font-size: 100%;
position: relative;
text-align: left;
cursor: pointer;
width: auto;
float: left;
/* Submenus should appear below their parent (top: 0) with a higher z-index, but they are initially off the left side of the screen (-1000em) */
ul.MenuBarHorizontal ul
margin: 0;
padding: 0;
list-style-type: none;
font-size: 100%;
z-index: 1020;
cursor: default;
width: 9em;
position: absolute;
left: -1000em;
/* Submenu that is showing with class designation MenuBarSubmenuVisible, we set left to auto so it comes onto the screen below its parent menu item */
ul.MenuBarHorizontal ul.MenuBarSubmenuVisible
left: auto;
/* Menu item containers are same fixed width as parent */
ul.MenuBarHorizontal ul li
width: auto;
text-align: left;
/* Submenus should appear slightly overlapping to the right (95%) and up (-5%) */
ul.MenuBarHorizontal ul ul
position: absolute;
margin: -5% 0 0 95%;
/* Submenu that is showing with class designation MenuBarSubmenuVisible, we set left to 0 so it comes onto the screen */
ul.MenuBarHorizontal ul.MenuBarSubmenuVisible ul.MenuBarSubmenuVisible
left: auto;
top: 0;
DESIGN INFORMATION: describes color scheme, borders, fonts
/* Submenu containers have borders on all sides */
ul.MenuBarHorizontal ul
border: 1px solid #CCC;
width: auto;
/* Menu items are a light gray block with padding and no text decoration */
ul.MenuBarHorizontal a
display: block;
cursor: pointer;
background-color: #20a6e0;
padding: 0.5em 0.75em;
color: #0f2b8c;
text-decoration: none;
text-align: left;
/* Menu items that have mouse over or focus have a blue background and white text */
ul.MenuBarHorizontal a:hover, ul.MenuBarHorizontal a:focus
color: #Fe2727;
/* Menu items that are open with submenus are set to MenuBarItemHover with a blue background and white text */
ul.MenuBarHorizontal a.MenuBarItemHover, ul.MenuBarHorizontal a.MenuBarItemSubmenuHover, ul.MenuBarHorizontal a.MenuBarSubmenuVisible
color: #F00;
SUBMENU INDICATION: styles if there is a submenu under a given menu item
/* Menu items that have a submenu have the class designation MenuBarItemSubmenu and are set to use a background image positioned on the far left (95%) and centered vertically (50%) */
ul.MenuBarHorizontal a.MenuBarItemSubmenu
background-image: url(SpryMenuBarDown.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
width: auto;
/* Menu items that have a submenu have the class designation MenuBarItemSubmenu and are set to use a background image positioned on the far left (95%) and centered vertically (50%) */
ul.MenuBarHorizontal ul a.MenuBarItemSubmenu
background-image: url(SpryMenuBarRight.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
/* Menu items that are open with submenus have the class designation MenuBarItemSubmenuHover and are set to use a "hover" background image positioned on the far left (95%) and centered vertically (50%) */
ul.MenuBarHorizontal a.MenuBarItemSubmenuHover
background-image: url(SpryMenuBarDownHover.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
/* Menu items that are open with submenus have the class designation MenuBarItemSubmenuHover and are set to use a "hover" background image positioned on the far left (95%) and centered vertically (50%) */
ul.MenuBarHorizontal ul a.MenuBarItemSubmenuHover
background-image: url(SpryMenuBarRightHover.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
color: #fe2727;
BROWSER HACKS: the hacks below should not be changed unless you are an expert
/* HACK FOR IE: to make sure the sub menus show above form controls, we underlay each submenu with an iframe */
ul.MenuBarHorizontal iframe
position: absolute;
z-index: 1010;
filter:alpha(opacity:0.1);
/* HACK FOR IE: to stabilize appearance of menu items; the slash in float is to keep IE 5.0 from parsing */
@media screen, projection
ul.MenuBarHorizontal li.MenuBarItemIE
  display: inline;
  f\loat: left;
  background: #FFF;

Answer 1

Reader Extended? Is that when you open the PDF in Acrobat Pro, go to Advanced, and click "Extend Features in Adobe Reader"? I did that and it still didn't work. Matter of fact it locked up the PDF when I tried to open it in Acrobat Pro 7 or 9.
Or is that Adobe Reader Extension ES package?