It is awkward to repair Windows files without the CD but try this as a first step :-
Start > Run, type “sfc /scannow” (not the quotes but the space) and press Enter. It will take some time and may ask for the XP CD.
SFC will exit with no closing dialogue. To see which files, if any, were replaced look in Event Viewer, hopefully sndvol.exe will be there. If SFC doesn’t start, the RPC locator service needs to be started in Start > All Programs > Administrative Tools, Services.
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