Curl/php/Apache on Win32

Hello Does anyone know how to install and use php_curl.dll for php. I set extension=c:\phpdev2\php\extension\ and also tried copying files SSLEAY32.dll, php4ts.dll, libeay32.dll in to the winodws system directory and set extension to that but still no sucess. I always get a error message saying "Warning: Unable to load dynamic library 'c:\phpdev2\php\extensions\php_curl.dll' - A device attached to the system is not functioning" And also try using Dependency Wlaker 2.1 but I get error of "Error: At least one module has an unresolved import due to a missing export function in an implicitly dependent module." Can anyone help Thanks