Sound driver

A friend of mine kindly re installed my computer and saved 100's of photographs after it completely crashed with a virus. It came back and everything worked perfectly except there is no sound whatsoever. I've checked the volume control and everything is greyed out and it says no audio device. I have been looking for a website to download from but they all want to scan my system for all sorts of updates.

Can anyone tell me what I need to download and where from

The system information is as follows :-

OS Name Microsoft Windows XP Home Edition
Version 5.1.2600 Service Pack 3 Build 2600
OS Manufacturer Microsoft Corporation
System Name ICT-ONKO997L6WC
System Manufacturer Packard Bell NEC
System Model 00000000000000000000000
System Type X86-based PC
Processor x86 Family 15 Model 2 Stepping 9 GenuineIntel ~2688 Mhz
BIOS Version/Date American Megatrends Inc. 1.0y, 31/01/2004
SMBIOS Version 2.3
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume2
Locale United States
Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
User Name ICT-ONKO997L6WC\ICT
Time Zone GMT Daylight Time
Total Physical Memory 512.00 MB
Available Physical Memory 37.88 MB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.96 GB
Page File Space 627.67 MB
Page File C:\pagefile.sys

Many thanks