core update openpublish

Hi,
Before few months, i have installed openpublish distribution in my server and launched my site. On top of that i have installed many modules and made some designs. But, I'm facing issue such as
"There is a security update available for your version of Drupal. To ensure the security of your server, you should update immediately! See the available updates page for more information and to install your missing updates"

I have successfully updated Drupal core previously by deleting and replacing all folders and files except the 'sites' folder.

I have installed OpenPublish today and tried the same approach with to update Drupal core from 7.16 to 7.17.

When I initiate update.php I get the following warnings:

Notice: Undefined index: highlighted in include() (line 126 of C:\wamp\www\example.net.au\openpublish\modules\system\page.tpl.php).
Notice: Undefined index: sidebar_first in include() (line 138 of C:\wamp\www\example.net.au\openpublish\modules\system\page.tpl.php).