Curl cannot be loaded. how can this problem be solved?

Curl cannot be loaded. how can this problem be solved? Curl PHP extension

Win7 64-bit
Wampserver2.4-x64.exe
Apache2.4.2 + php5.4.3 + mysql5.5.24
Error reported when curl cannot be loaded
Fatal error: Call to undefined function curl_init () in F: \ 1wwwroot \ phpwind_v9.0_utf8 \ upload \ cs. php on line 35

Configuration
Extension_dir = "d:/wamp/bin/php/php5.4.3/ext /"
Extension = php_curl.dll
These two,
The ext folder of php has been added to the environment variable.
Php error statements

$ch = curl_init();

Error reported when curl cannot be loaded
Fatal error: Call to undefined function curl_init () in F: \ 1wwwroot \ phpwind_v9.0_utf8 \ upload \ cs. php on line 35

What else do I need? What configuration is required?

Reply to discussion (solution)

Check whether libeay32.dll and ssleay32.dll exist.

Check whether libeay32.dll and ssleay32.dll exist.

In this directory, D: \ wamp \ bin \ php \ php5.4.3 has these two files. then I copied them to system32 and did not register any components.
Php_curl 633 KB (648,704 bytes)

Php_curl.dll is 64-bit ?? ?? Vc? OK? And Ben? Ann? Is it consistent?
Same? Yes? Dll file, him? There are many different versions. what is the difference between different versions? Legal work. if yes? Parts? You can do it yourself ?? I? Dll, no? ? Search ????? "Win7 64-bit vc? Under php_curl.dll? "

Php_curl.dll is 64-bit ?? ?? Vc? OK? And Ben? Ann? Is it consistent?
Same? Yes? Dll file, him? There are many different versions. what is the difference between different versions? Legal work. if yes? Parts? You can do it yourself ?? I? Dll, no? ? Search ????? "Win7 64-bit vc? Under php_curl.dll? "

I downloaded the wampserver environment for installation.