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 I found this answer for you.

To play games on Yahoo with no hassles from your PC please read on, do one thing at a time till you get in, or do them all for hassle free games on yahoo..... 
click "tools" top of you browser a little pull down menu will appear ...... 
.click pop up blocker............ best advice is to turn it off..(ENABLE POPUPS)...of course some will say it is a mistake to turn it off but you can decide this for yourself once you know where it is, nothing bad or evil will happen if you decide to turn it off, so it is not a mistake, it is just a choice you make......... pop ups are very easy to just click off if they appear....once in the lounge........click "options" bottom left of the lounge and choose the small tables/windows option 

Make sure you are not running multiple task bars that have their own pop up blocker. 


If problems still persist read on........... 
Yahoo will not tell you when they update, they just do it. So when games/chat have a problem you can bank on it that Yahoo have updated..and Yahoo update often...When yahoo updates you must update as well 

there are 2 choices of Java you can use.......Sun Java and Virtual Machine....some prefer the sun java 
but the Virtual Machine works better for games and you do need Java to play in games, ( without it some won't get in and if some do get in , they won't stay in games) 

Update............. -- If you cant log into chat/games or you continually freeze, it is because Yahoo's browser has issues with SUN java as default, the coffee cup sux... The Virtual Machine Java works better with yahoo. Yahoo is Java dependant. 
This is also the reason for the games applets not loading and some web cam issues. The easiest fix is to update , make sure all your windows are updated 
Click this link http://www.freecreed.com/pm.html ... ... 
and choose what is your best option. 

N.B. It is unwise to use Sun Java and Virtual machine together, this may cause conflicts 
After December 31st 2007 Virtual Machine will not be supported by Microsoft, there will be no enhancements. Which means VM will still work, but will not be updated 
http://www.microsoft.com/mscorp/java/ 

and clean up after yourself> http://www.freecreed.com/speed.html 

read on if you still cannot get in 

Right click your explorer icon on your desktop......click properties..then the general tab (top left)..in the temporary internet files section (middle), choose view objects...see all Yahoo downloaded programme files? 
if any are damaged, right click them and delete them..they reload each time you logg into games..right click them all and choose update, or bite the bullit and delete it.......it reloads each time you logg in.

Source > https://answers.yahoo.com/question/index?qid=20070410160025AA4IdBX