THERE is no verification done when i try to enter the chat room so im not able to access chat rooms....i have tried almost evrything like latest version of ym ie9

You can consalt at yahoo answer if you not you found then go on link http://problemslotioncsp.blogspot.com/2011/10/error-999-slotion-yahoo.html

Once you've selected a Chat room, you'll be brought to the Chat room window where you'll see your Yahoo! IDlisted as well as the Messenger Chat Administrator. You won't see anyone else listed in the Chat room until you've passed the verification process. To do this you'll need to click the verification link given in the Chat room window. The "Chat Room Verification" window opens, where you can enter the word verification text (please note that this text is not case sensitive).

If you don't see the "Chat Room Verification" window load when clicking on the verification link, this is maybe because you currently have pop-up blocker software installed. To confirm that pop-up blocker software is interfering with loading of the "Chat Room Verification" page, please hold the Ctrl key down while clicking the verification link and the new window should load. Now all you'll need to do is to enter the word verification text and click Submit