It looks like you might not have CURL. Check the php.ini file and make sure this line is present
extension=php_curl.dll
Make sure there is no semicolon in front of it. Then restart apache
EDIT
Create a new file and put it in your webroot. Put the following command in this file and load it
<?php
phpinfo();
All modules downloaded for your installation will be shown here. Find the section curl
. If it does not appear, you are editing the wrong one php.ini
.
The path php.ini
is indicated at the top. Open it and do the necessary.