No sound device

Hello,

Windows XP was reisntalled but now I have no sound device. How can I install it. Below is my system summary:
OS Name Microsoft Windows XP Professional
Version 5.1.2600 Service Pack 3 Build 2600
OS Manufacturer Microsoft Corporation
System Name BETTY
System Manufacturer Dell Inc.
System Model OptiPlex 745
System Type X86-based PC
Processor x86 Family 15 Model 6 Stepping 5 GenuineIntel ~3192 Mhz
BIOS Version/Date Dell Inc. 2.3.1, 5/21/2007
SMBIOS Version 2.3
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
User Name BETTY\Betty
Time Zone E. Africa Standard Time
Total Physical Memory 2,048.00 MB
Available Physical Memory 1.04 GB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.96 GB
Page File Space 4.77 GB
Page File C:\pagefile.sys