how do i find the right driver for my windows xp sound card

Computer System
Manufacturer: INTEL_
Model: D945GCR_
Operating System
Microsoft Windows XP Home Edition (Service Pack 3)
Version: 5.1.2600
Build Number: 2600
Install Date: 10/01/2010
Install Directory: C:\WINDOWS1
Locale: English (en) - United States (US)
DirectX version: DirectX 9.0c (4.09.0000.0904)
Motherboard
Manufacturer: Intel Corporation
Model: D945GCPE (vAAD97209-202)
Bios
Manufacturer: Intel Corp.
Model: PE94510M.86A.0064.2008.0215.1714
Release Date: 15/02/2008
Processors
1.Intel(R) Pentium(R) 4 CPU 2.66GHz (GenuineIntel)
Max clock speed: 2.66 GHz
Socket: LGA 775
Version: Model 3, Stepping 4
Memory
Total Current Physical Memory: 1.99 GB
Total Current Virtual Memory: 2.00 GB
Maximum Memory Capacity: 4.00 GB
Memory Devices:
1.Type: DDR-2* - Speed: 533 MHz - Capacity: 1.00 GB
2.Type: DDR-2* - Speed: 533 MHz - Capacity: 1.00 GB
Video Devices
1.Intel(R) 82945G Express Chipset Family
Resolution: 1024 x 768
Colour Depth: 32 Bits
Refresh Rate: 60 Hz
Sound Devices:
1.Realtek High Definition Audio
Physical Disk DrivesVolumesLogical Disks
1.A: Disk Type: 3 1/2 Inch Floppy Drive
File System: Capacity: 0.00 GB
Free Space: 0.00 GB
2.C: 80 gig
Disk Type: Local Fixed Disk
File System: NTFS
Capacity: 74.52 GB
Free Space: 52.39 GB
3.D: Disk Type: CD-ROM Disc
File System: Capacity: 0.00 GB
Free Space: 0.00 GB
Page Files:
1.c:\pagefile.sys
Initial Size: 2.00 GB
Current Size: 2.00 GB
Maximum Size: 4.00 GB
File System: NTFS
Optical Drives
1.ATAPI DVD LS 8X16X8X16 - D:
Printers
1.Microsoft XPS Document Writer (port: XPSPort
2.KODAK 5500 AiO (port: USB001)
Network Adapters
1.Realtek PCIe FE Family Controller - Packet Scheduler Miniport
IP Address: 192.168.XXX.XXX
Default Gateway: 192.168.15.1
Subnet Mask: 255.255.255.0
Primary DNS: 192.168.1.254
Security Software
Anti-Virus
1.Antivir Solution Pro v3.1(1835) (Antivir Solution Pro Inc.)
2.McAfee VirusScan (McAfee)
Firewall
1.McAfee Personal Firewall (McAfee)
* inferred from RAM speed

IDT High Definition Audio CODEC - Free software downloads and software reviews - CNET Download.com