Dimension 8400- No sound

heres a everest system report if you would need it..

--------[ EVEREST Ultimate Edition 2006 (c) 2003-2006 Lavalys, Inc. ]---------------------------------------------------

Version EVEREST v3.01.652
Benchmark Module 2.0.160.0
Homepage http://www.lavalys.com/
Report Type Report Wizard [ TRIAL VERSION ]
Computer TODD1 (Minelol3)
Generator David C. Gardner
Operating System Microsoft Windows XP Professional 5.1.2600 (WinXP Retail)
Date 2006-08-02
Time 04:47


--------[ Summary ]-----------------------------------------------------------------------------------------------------

Computer:
Computer Type ACPI Multiprocessor PC
Operating System Microsoft Windows XP Professional
OS Service Pack [ TRIAL VERSION ]
Internet Explorer 6.0.2900.2180 (IE 6.0 SP2)
DirectX 4.09.00.0904 (DirectX 9.0c)
Computer Name TODD1 (Minelol3)
User Name David C. Gardner
SMTP E-mail Address Dave
Logon Domain [ TRIAL VERSION ]
Date / Time 2006-08-02 / 04:47

Motherboard:
CPU Type Intel Pentium 4 550, 3400 MHz (17 x 200)
Motherboard Name Dell Dimension 8400
Motherboard Chipset Intel Alderwood i925XE
System Memory [ TRIAL VERSION ]
BIOS Type Phoenix (08/23/04)
Communication Port Communications Port (COM1)
Communication Port ECP Printer Port (LPT1)

Display:
Video Adapter RADEON X300 Series Secondary (128 MB)
Video Adapter RADEON X300 Series (128 MB)
3D Accelerator ATI Radeon X300/X550 (RV370)
Monitor Dell E173FP [17" LCD] (641804B509AS)

Multimedia:
Audio Adapter Analog Devices AD1980 @ Intel 82801FB ICH6 - AC'97 Audio Controller [B-1]

Storage:
IDE Controller Intel(R) 82801FB/FBM Ultra ATA Storage Controllers - 266F
IDE Controller Intel(R) 82801FR SATA AHCI Controller
Disk Drive WDC WD800JD-75JNA0 (74 GB, IDE)
Optical Drive PHILIPS DVD+-RW DVD8701 (DVD+R9:8x, DVD+RW:16x/8x, DVD-RW:16x/6x, DVD-ROM:16x, CD:48x/32x/48x DVD+RW/DVD-RW)
SMART Hard Disks Status Unknown

Partitions:
C: (NTFS) [ TRIAL VERSION ]

Input:
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse HID-compliant mouse

Network:
Primary IP Address [ TRIAL VERSION ]
Primary MAC Address 00-16-B6-57-A3-F2
Network Adapter Broadcom NetXtreme 57xx Gigabit Controller
Network Adapter Linksys Wireless-G PCI Network Adapter with SpeedBooster (192. [ TRIAL VERSION ])
Modem Communications cable between two computers
Modem Conexant D850 56K V.9x DFVc Modem #2

Peripherals:
Printer Dell Photo AIO Printer 922
Printer Fax
USB1 Controller Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
USB1 Controller Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
USB1 Controller Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
USB1 Controller Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
USB2 Controller Intel 82801FB ICH6 - Enhanced USB2 Controller [B-1]
USB Device Kensington PilotMouse Laser - 3 Button

DMI:
DMI BIOS Vendor Dell Inc.
DMI BIOS Version A02
DMI System Manufacturer Dell Inc.
DMI System Product Dimension 8400
DMI System Version
DMI System Serial Number [ TRIAL VERSION ]
DMI System UUID [ TRIAL VERSION ]
DMI Motherboard Manufacturer Dell Inc.
DMI Motherboard Product 0U7077
DMI Motherboard Version
DMI Motherboard Serial Number [ TRIAL VERSION ]
DMI Chassis Manufacturer Dell Inc.
DMI Chassis Version
DMI Chassis Serial Number [ TRIAL VERSION ]
DMI Chassis Asset Tag [ TRIAL VERSION ]
DMI Chassis Type Mini Tower

I tried downloading SB Audigy 2 which was what I had assumed was in the integrated system after reading up on it and when I tried to install the driver it said

"Setup is unable to find a supported product on your system. Please make sure you installed the product correctly. Setup will now exit."

I don't know what the problem is, it's supposed to be an integrated system, I don't know how it wouldnt be installed correctly when it was working just the other day, I can't system restore because I had to turn it off to delete a virus that was on my computer. Can anyone help?