Lailia, how sudden did your computer loose sound? It could be that your speakers blew out. You might be able to pick up a set of speakers to hook up like the ones below:

http://www.amazon.com/b/ref=amb_link_648..._rd_i=193870011

Or maybe you need a new sound card:

http://www.amazon.com/b/ref=amb_link_648..._rd_i=193870011

It may not be as expensive as having to get a new computer.

PS: I love the little girl, in the video, that has blue/black hair. And the house is AWESOME. I wish our house was that big.