Unable to download files needed 4 installation

Go to Start>Control Panel > Add or remove programs remove all the things related yahoo ( Yahoo toolbar, Yahoo mail advisor, Yahoo installer, Yahoo browser plus etc.) Try download and install then....If still same try download offline installer http://download.yimg.com/ycs/msg/dl/msgr10/us/b4/msgr10us.exe
if still you are having difficulty download old version like Yahoo messenger 8 or Yahoo messenger 7
I think it will help you..Further result please let us know... Thanks for being with Fixya...Good Luck