The ways to remove this YM 9 Ads is simple: Just make the ads don't allow to download from the internet address resources servers. This means, by modified the way we connect to the internet, Yahoo Messenger 9 Ads would be removed and disappears forever.
This trick works in almost of Windows Version: 200, XP, Vista even Windows 7. The trick is simple. Just open the Hosts File in c:\Windows\System32\drivers\etc\hosts and then edit the file using notepad and add the line
in the hosts file.
For vista users, you may need to open notepad first as run as administrator before you open the host file in c:\Windows\System32\drivers\etc\hosts and you have to change the folder option to disable "hide operating system files" before you can open the host file.
After you add the 127.0.0.1 insider.msg.yahoo.com in the hosts file, that means you'll connect to local host when the internet connection try to open insider.msg.yahoo.com (that usually used to download banner ads of Yahoo Messenger and other functions). This would make the Yahoo Messenger 9 Ads load an error blank page. This means the ads would disappear!
Using this trick sometimes make the plugin and others features of Yahoo Messenger would disable also. Be wise!