By default appserv don’t enable curl extension. To enable that extension you need to check the following section :
1. php extension directory
Make sure you see php_curl.dll in the list.

As you see php_curl listed in  you can continue.

2. Open php.ini

Delete ; sign in front of extension=php_curl.dll

;extension=php_mbstring.dll
;extension=php_bz2.dll
;extension=php_curl.dll
;extension=php_dba.dll
extension=php_dbase.dll
;extension=php_exif.dll
;extension=php_fdf.dll
;extension=php_filepro.dll
extension=php_gd2.dll
;extension=php_gettext.dll

save the file.

3. Restart apache service

Try again to run script that utilize curl() related function.

See you in other post!