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Sound System repair on Dell Dimension C521

How do you get  the XP Pro Operating System disk when in the repair mode to replace missing software from your OS on your Hard Disk?  I have a Dell Dimension C521.  95%    of the computer works fine.  The High Definition  Sound Software and it's associative parts are missing or malfunctiloning.  I do not want to do  a completely fresh install of the operating system because it will clobber all of the existing programs on my drive. Thje Sigma Tel driver is the latest  version.  The sound board components are mounted on the Motherboard. I have looked for an alternate  Low Profile  sound  Board from Sound Blaster that is a PCI compliant. no luck   Has any one got an idea to work around this problem?
Thanks, Steve Chapman
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I found a 4ch PCI Low profile on Ebay.  Will test in a few days. I believe this answer will save me some gray hairs. Tnx for the help
you're welcome !
The replacement of a low profile sound card is potential  work around  for the failed Dell motherboard audio and associated software of the Dell C521. This will be tried as so0n as the hardare sound ncard arrives. IUpdating drivers is not a solution that has  worked to repair missing  operatiing system  software modules..

My drivers have been checked and they  are the latest version. I have one situation where the Sound Driver reports it is enabled. The device reports it is enabled but not working correctly

The outstanding question is how to use the Windows  XP Pro Operating System  Disk in a repair mode to actually replace the missing software and not do a complete OS new install

Is  there any diagnostic software that will show you  what program modules are actually missingt?  I can see what Modules are running., what  programs are loaded and see the required DLL
All help in this area is greatly appreciated,
Steve Chapman