Why won't my yahoo pool work ?

Simple. It's corrupt.
Since, no file structure details are provided I can't help.

Either try restoration softwares and check for accidentially deleted files in Yahoo folder or reinstall it.

It's not necessary that the current version would totally uninstall itself. A manual approach is needed.

For next time beware using PC cleaner utilities or blank deletion of unused files.

all yahoo game don't work

I had to download the java engine from Sun when I got my new computer. It doesn't come preinstalled with IE any more.

Go to their Q&A section and one of the questions answers it. It is really easy to do. You just follow the link to the Sun website and click install (or something like like).

Oh, you have to turn off popups to do the install to maybe. I don't remember for sure.

What do you mean?
Can you give more description?
You can't get in the lobby or you can't load the game....
Give more details, please