Recently, Yahoo has released an updated version of Yahoo Messenger 10. According to Sarah Bacon,Yahoo Product Manager, this latest release includes several bug fixes to enhance stability and performance of new video call feature. Several of the fixes improve video calling on PCs running Windows 7.
The latest Version of Yahoo Messenger can be downloaded from http://messenger.yahoo.com/download/win.
And Also you can download offline setup via Direct Download Link ( Thanks to My Digital Life for Links )