Need Help With This one.

I just got a dell computer from my brother it's a 4800 midtower runing with a Pentium (R) 4 CPU 2.00GHz 512 MBs worth of ram 40 gig harddrive.now i haveing trouble with the sound not working at all not even the device it self.I just did a reformat on the hard drive because it had sooo much crap on it.It ran slower than my grandmother.But i have just tryed every thing to get it too work.If any one here no's what to do i would very happy i dont ask for much if any thing i help more.But any way need some help with this.I might have to ask my brother if he has the windows disk at his place for this computer.

Thank you

Chris B.......

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Fixes For Limewire When LW Isn't Operating As It Should
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Some time's i just want to throw my computer out the window