in the php.ini file there is a setting for the extensions directory. make sure that the extensions directory is pointing to the C:\wamp\bin\php\ph5.3.13\ext\
The best place to get support for WAMP is on the WAMP site, we do not offer support for WAMP.
there is 1 of 2 things here:
1) the php_curl.dll file is bad
2) The php.ini file is not pointing to the correct extensions directory.