Problem installing Windows live Messenger

Hello,
I've got this error message whenever I've tried to install Windows Live messenger. I am using Windows 7 operating system pro 32 bit. Need your help. Please give me a suggestion.
Thanks in advance
Windows Live Messenger
We can't sign you in to Windows Live Messenger
There might be a problem with your Internet connection. Make sure your computer is connected to the internet.
Windows Live Messenger can't sign you in right row. Please check to make sure your firewall is not blocking Windows Live Messenger.
For information on how to add a program to the allow list of the firewall, see the firewall's documentation or website.
Error code: 80072745
80072745

