The easy to use and easy to manage Yahoo messenger is the perfect addition to your Windows Vista set up.
You will first have to go to the yahoo messenger site (http://messenger.yahoo.com/0 and click on the download now button.
When the pop up window appears click the ok button. When prompted, save the install file on the desktop of your computer. When it is done downloading the window will automatically close.
Click on the installer icon that you previously saved on your desktop. This should open an installation window. follow the specified prompts so that you can accept the Yahoo Messenger terms and modify your installation settings according to your needs.
Enter your Yahoo ID and Password and you should be able to sign on to the Yahoo messenger.