How can i repair my problem?

Hi! I have a problem… Some days ago, my unity web player failed. It says ’ error launching unity player’ only in internet games. I have a Mac Os X 10.5.8 version. I want play the games and i can’t… I desinstalled the program and i installed it again. Plese help me!!! Thanks!!! Can you say me a easy solution? Because when the solution is confused i don;t understand very much…

If i have a problem in the text is because i am learning english… I am from Argentina!! Bye

Hi! Now i can play one game… The others games have the same problem!!! I know that the problem isn’t in the page i play! It is an other problem… I can’t use an other browser, because it’s a family problem.