Deleted Soundmax by mistake

I deleted soundmax by mistake today now I have no sound . under device manager big yellow question mark saying multimedia audio controller . im using dell pc dell dimension 4600 series. Windows xp . please help . thank you.
 
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List any Problem devices
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  • Click Start->Run, enter: msinfo32. Click the + sign next to Components to expand it
  • Click Problem Devices. Anything appear?
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  • On the other hand, if no devices are listed, tell me so
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    ===> If you’re running 64 bit Windows, you’ll see 64-bit DxDiag. Click it to launch the 64-bit version of dxdiag
  • Notice progress in lower left window corner
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