Remove "product information, reviews, tags" block from product page

You should have to create local.xml file inside your frontend theme folder app/design/frontend/[your_package]/[your_theme] (if you haven't already)

And insert the following lines there

<?xml version="1.0"?>

<layout version="0.1.0">

<catalog_product_view>
    <reference name="product.info.tabs">
        <action method="unsetChild">
            <child>description</child>
        </action>
        <action method="unsetChild">
            <child>additional</child>
        </action>
    </reference>
</catalog_product_view>

</layout>

you can change your tag name to your product description and extra information tag given in theme.

Admin Panel -> System -> Advanced -> Mage_Tag = "Disable"

Create local.xml and paste the below code.

<?xml version="1.0" ?>
<layout>
  <default>
     <remove name="product_tag_list" />
  </default>
<layout>