hey onkar.
div isnot a plugin - is it a part of website code
So, what we know:
1. You have instaled working theme (free coded version fresh coppy from authors page)
2. theme works fine on "pure" configuration.
3. You add custon codes into themes.php?page=functions.php and widgets areas:
a) google search engine addon
b) google adwords code
c) koomona ads code
d) myfreecopyright.. code
e) smowtion ad code
4) so probably one or more from codes above You copy pasted without closing tag.
Try to disable all widgets and ad areas
I suggest You to disable codes in turn - when you know what code You copied with errors.