I was having problems myself, where the middle section on some pages would be shifted over to the left in IE8, overlapping the main menu and not stretching all the way across to the right.
Here's how to fix that. Browse to the template's installation folder, which should be "/templates/ja_purity/". Edit the index.php file.
Search for this line:
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<!--[if gte IE 7.0]>
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<!--[if IE 7.0]>