Posted by Apptivo Business Advisory Team

  1. Download Memcached on your computer
  2. Install Memcached service, then run it.
  3. Verify your PHP code is compiled with Memcached.  If not, you’ll need to recompile or download a pre-compiled version of PHP.
  4. Load the memcached extension from within PHP, and restart your web server.
  5. Memcached should now be functioning.

See this URL for further details: http://pureform.wordpress.com/2008/01/10/installing-memcache-on-windows-for-php/