Instructions:
Download the Open SSL Installer http://www.shininglightpro.com/products/Win32OpenSSL.html
->
Install Open SSL
->
Restart Computer
->
Open mIRC
->
$sslready should now return $true

This is probably the installer you need: http://www.shininglightpro.com/download/Win32OpenSSL-0_9_8e.exe