Problem connecting and loading my games

On my first account when i try to open a game it attempts to connect to java but wont work and tells me to install the sun java 6 thing but it still does not work if i reinstall it. my friend suggested to make a new account so I made this one and the games open in a new tab but the screen just stays white and the game does not load. What should i do it is only on this computer when i start my games on any other computers it works fine. I have tried to open my games on Firefox Internet Explorer and Goggle Chrome same problem for all of them