Composer is not getting installed windows 7

I'm trying to install Composer for on my Window 7 OS but its giving me following error:

Connection Error [ERR_CONNECTION]: Unable to connect to getcomposer.org
Request to http://ift.tt/SI3ujS failed with errors:
Failed to open stream: No connection could be made because the target machine actively refused it.

My PHP Configuration is :

PHP Version 5.5.22

Apache 2.2.13

What could be the issue?