How to install mcrypt on PHP 5.4?

I have a Windows XP machine that I have to use temporarily. The newest version of wamp I can install is wamp 2.4 which comes with PHP 5.4.

I downloaded an mcrypt zip file and it has files like mcrypt.exe, cygmcrypt-4.dll, cygwin1.dll etc. So I installed cygwin and ran mcrypt.exe it just asked me to enter a passphrase and that's it.

I found an mcrypt.dll but wamp complains saying that it was compiled with an API different from the API PHP was compiled with.

Im lost.

Do the one thing you think you cannot do. Fail at it. Try again. Do better the second time. The only people who never tumble are those who never mount the high wire.