This is how you enable curl if you are using xampp as your testing server
*note, different versions may have the php.ini file in a different location
1) Locate the following files:
C:\Program Files\xampp\php\php.ini
* other versions may also have multiple ini files here
C:\Program Files\xampp\apache\bin\php.ini
C:\Program Files\xampp\php\php4\php.ini
2) Uncomment the following line on your php.ini file by removing the semicolon.
( *around line 952 on my version)
;extension=php_curl.dll
3) Restart your apache server.