I have read many SIS sound driver problems in this forum, and unfortunately none came up with a solution that works on this system.

I completed a format of this computer yesterday and it came up with multimedia audio controller software missing. I have tried to install several of the available SIS 7012 drivers to no avail, each one comes up with an error during installation. The error simply has a window that says UpdateDriverForPlugAnd PlayDevices -536870397, I close this error and it says driver was not installed. I also tried a different version of this driver and it then comes up with an error (10) saying this device is not installed or working. I have also tried the AC97 drivers that several people have suggested, this driver does install ok, but the sound does not work at all, nor microphones.

Can anyone please help with this? Everest information below:

Code:
--------[ EVEREST Home Edition (c) 2003-2005 Lavalys, Inc. ]------------------------------------------------------------

    Version                                           EVEREST v2.20.405
    Homepage                                          http://www.lavalys.com/
    Report Type                                       Report Wizard
    Computer                                          VIV (Purrrple's PC)
    Generator                                         purrrple
    Operating System                                  Microsoft Windows XP Professional 5.1.2600 (WinXP Retail)
    Date                                              2009-07-31
    Time                                              15:37


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

    Computer:
      Operating System                                  Microsoft Windows XP Professional
      OS Service Pack                                   Service Pack 2
      DirectX                                           4.09.00.0904 (DirectX 9.0c)
      Computer Name                                     VIV (Purrrple's PC)
      User Name                                         purrrple

    Motherboard:
      CPU Type                                          AMD Duron, 1200 MHz (12 x 100)
      Motherboard Name                                  ECS K7SOM+
      Motherboard Chipset                               SiS 740
      System Memory                                     736 MB  (PC2100 DDR SDRAM)
      BIOS Type                                         AMI (04/22/03)
      Communication Port                                Communications Port (COM1)
      Communication Port                                ECP Printer Port (LPT1)

    Display:
      Video Adapter                                     RADEON 9250 - Secondary  (128 MB)
      Video Adapter                                     RADEON 9250  (128 MB)
      Video Adapter                                     SiS 650_651_M650_M652_740  (4 MB)
      3D Accelerator                                    ATI Radeon 9250 (RV280)
      3D Accelerator                                    SiS 315 Integrated
      Monitor                                           HP 7500  [17" CRT]  (CN345XF122)

    Multimedia:
      Audio Adapter                                     SiS 7012 Audio Device

    Storage:
      IDE Controller                                    SiS 5513 IDE UDMA Controller
      Floppy Drive                                      Floppy disk drive
      Disk Drive                                        Maxtor 6Y160P0  (160 GB, 7200 RPM, Ultra-ATA/133)
      Disk Drive                                        QUANTUM FIREBALLlct20 20  (19 GB, 4500 RPM, Ultra-ATA/100)
      Optical Drive                                     CyberDrv CW099D CD-R/RW  (52x/24x/52x CD-RW)
      Optical Drive                                     PIONEER DVD-RW  DVR-110D  (DVD+R9:8x, DVD-R9:8x, DVD+RW:16x/8x, DVD-RW:16x/6x, DVD-RAM:5x, DVD-ROM:16x, CD:40x/32x/40x DVD+RW/DVD-RW/DVD-RAM)
      SMART Hard Disks Status                           OK

    Partitions:
      C: (NTFS)                                         19469 MB (15629 MB free)
      D: (NTFS)                                         78159 MB (78093 MB free)
      E: (NTFS)                                         78159 MB (78093 MB free)
      Total Size                                        171.7 GB (167.8 GB free)

    Input:
      Keyboard                                          PC/AT Enhanced PS/2 Keyboard (101/102-Key)
      Mouse                                             Microsoft PS/2 Mouse

    Network:
      Network Adapter                                   SiS 900 PCI Fast Ethernet Adapter  (192.168.1.222)

    Peripherals:
      USB1 Controller                                   SiS 7001 PCI-USB Open Host Controller
      USB1 Controller                                   SiS 7001 PCI-USB Open Host Controller
      USB2 Controller                                   SiS 7002 USB 2.0 Enhanced Host Controller

--------[ Chipset ]-----------------------------------------------------------------------------------------------------

  [ North Bridge: SiS 740 ]

    North Bridge Properties:
      North Bridge                                      SiS 740

--------[ Motherboard ]-------------------------------------------------------------------------------------------------

    Motherboard Properties:
      Motherboard ID                                    62-0422-001131-00101111-040201-SiS740$K7SOM+_K7SOM+ RELEASE 04/22/2003 S
      Motherboard Name                                  ECS K7SOM+

    Front Side Bus Properties:
      Bus Type                                          DEC Alpha EV6
      Bus Width                                         64-bit
      Real Clock                                        100 MHz (DDR)
      Effective Clock                                   200 MHz
      Bandwidth                                         1600 MB/s

    Memory Bus Properties:
      Bus Type                                          DDR SDRAM
      Bus Width                                         64-bit
      Real Clock                                        100 MHz (DDR)
      Effective Clock                                   200 MHz
      Bandwidth                                         1600 MB/s

    Chipset Bus Properties:
      Bus Type                                          SiS MuTIOL
      Bus Width                                         16-bit

    Motherboard Manufacturer:
      Company Name                                      Elitegroup Computer Systems
      Product Information                               http://www.ecs.com.tw/ECSWeb/Products/ProductList.aspx?CategoryID=1&MenuID=16&LanID=0
      BIOS Download                                     http://www.ecs.com.tw/ECSWeb/Downloads/Category_Download.aspx?Categoryid=1