Cant use IE 9 at work

My website appears distorted when on IE 8. For instance, tabs and drop downs are not visible on the home page. I know that WordPress advocates for using the most recent update to the platform but my company has not auth’d the use of IE 9. The website appears ok when I am on IE 9 at home.

My concern is for people reading my site that also do not have nor know how to update their platform (Internet Explorer etc)(My readers tend to be older and some with limited experience with computers). Is there a way to adjust settings for different platforms? Is the choice of layout, ie Twenty Twelve vs Twenty Eleven, a fix for this problem. I just want the best presentation possible for my website.

My website is http://www.caringisorganic.com. Unfortunately you can’t see the difference unless you switch your program to IE8. You should then see that there is no banner that is scrolling at the top of the header and that the tabs that separate the banner and the body of the text is missing. Also the drop downs are listed rather than dropping from tabs (That are non existent).