Vista sound problem Help please!!

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Hello, I just got a windows vista hp computer. I have had no problem with it at all until now. I open graal, go on my server, dev xXdaisukeXx, and I cant hear any sound at all on the graalonline client. I thought it might be the server, so I go to era and it still happens, no sound at all.

I go on graal editor and play it and it works fine. Not on the graal client though. How Can I fix this?
I put my sound up all the way in F3, and nothing.

Someone please help me.

Warm regards,

-Jamerson61894