CAN'T GET VOICE IN YAHOO CHATROOMS
If you are using Windows Vista then you need to be using Yahoo! Messenger 9.0 (the latest is 9.0.0.2162). Yahoo! has fixed voice for Vista users in this version. Please note there are a couple exceptions. For some reason those who are using Windows Vista Home Basic might not be able to get voice, no idea why. If you are using Windows Vista Home Premium you should be good to go for voice. Also Norton Internet Security has been known to cause issues with voice. I do not know what settings to change to fix that or if it is even possible. I also have known people who have not kept up with Windows Updates to have voice problems. For some weird reason too, some people who more successful at getting voice in the Yahoo! chat rooms if they plugged in a mic. This is just what a couple Vista users have told me.
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Full Installer for Yahoo Messenger 9.0.0.2162
http://download.yimg.com/ycs/msg/dl/msgr9/us/ymsgr900_2162_us.exe
DOWNLOAD AND INSTALLATION TIPS FOR Y!M
Try downloading the full installer of Yahoo Messenger (see link above) and save it to your desktop. It comes directly from a yahoo server and by-passes the web installer that most use. If on Windows Vista right click the full installer and choose “Install as Administrator”.
Vista users if still unable to install it, after you download the installer, you might have to temporarily disable the User Account Control (UAC). You can easily turn it back on. On the Control Panel (Category View) choose User Accounts and Family Safety, next choose User Accounts, and then click Turn User Account Control on or off.