I have spent many many many hours trying to find this.  No luck yet.  I posted here because I saw you had the same issue.  There most be other people too.  Somebody somewhere most know something,  We just have to find them.

=========== 
PCI devices 
=========== 
 
 
PCI\VEN_104C&DEV_8039&SUBSYS_FF311179&REV_00\4&6B16D5B&0&20F0: Texas Instruments PCIxx12 Cardbus Controller
PCI\VEN_104C&DEV_803A&SUBSYS_FF311179&REV_00\4&6B16D5B&0&21F0: Texas Instruments OHCI Compliant IEEE 1394 Host Controller
PCI\VEN_104C&DEV_803B&SUBSYS_FF311179&REV_00\4&6B16D5B&0&22F0: Texas Instruments PCIxx12 Integrated FlashMedia Controller
PCI\VEN_104C&DEV_803C&SUBSYS_FF311179&REV_00\4&6B16D5B&0&23F0: SDA Standard Compliant SD Host Controller
PCI\VEN_8086&DEV_1092&SUBSYS_FF311179&REV_02\4&6B16D5B&0&40F0: Intel(R) PRO/100 VE Network Connection
PCI\VEN_8086&DEV_2448&SUBSYS_00000000&REV_E2\3&B1BFB68&0&F0 : Intel(R) 82801 PCI Bridge - 2448
PCI\VEN_8086&DEV_27A0&SUBSYS_00000000&REV_03\3&B1BFB68&0&00 : Mobile Intel(R) 945GM/PM/GMS/940GML/943GML and Intel(R) 945GT Express Processor to DRAM Controller - 27A0
PCI\VEN_8086&DEV_27A2&SUBSYS_FF311179&REV_03\3&B1BFB68&0&10 : Mobile Intel(R) 945GM Express Chipset Family
PCI\VEN_8086&DEV_27A6&SUBSYS_FF311179&REV_03\3&B1BFB68&0&11 : Mobile Intel(R) 945GM Express Chipset Family
PCI\VEN_8086&DEV_27B9&SUBSYS_00000000&REV_02\3&B1BFB68&0&F8 : Intel(R) 82801GBM (ICH7-M) LPC Interface Controller - 27B9
PCI\VEN_8086&DEV_27C4&SUBSYS_FF311179&REV_02\3&B1BFB68&0&FA : Intel(R) 82801GBM/GHM (ICH7-M Family) Serial ATA Storage Controller - 27C4
PCI\VEN_8086&DEV_27C8&SUBSYS_FF311179&REV_02\3&B1BFB68&0&E8 : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C8
PCI\VEN_8086&DEV_27C9&SUBSYS_FF311179&REV_02\3&B1BFB68&0&E9 : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C9
PCI\VEN_8086&DEV_27CA&SUBSYS_FF311179&REV_02\3&B1BFB68&0&EA : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CA
PCI\VEN_8086&DEV_27CB&SUBSYS_FF311179&REV_02\3&B1BFB68&0&EB : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CB
PCI\VEN_8086&DEV_27CC&SUBSYS_FF311179&REV_02\3&B1BFB68&0&EF : Intel(R) 82801G (ICH7 Family) USB2 Enhanced Host Controller - 27CC
PCI\VEN_8086&DEV_27D0&SUBSYS_00000000&REV_02\3&B1BFB68&0&E0 : Intel(R) 82801G (ICH7 Family) PCI Express Root Port - 27D0
PCI\VEN_8086&DEV_27D2&SUBSYS_00000000&REV_02\3&B1BFB68&0&E1 : Intel(R) 82801G (ICH7 Family) PCI Express Root Port - 27D2
PCI\VEN_8086&DEV_27D4&SUBSYS_00000000&REV_02\3&B1BFB68&0&E2 : Intel(R) 82801G (ICH7 Family) PCI Express Root Port - 27D4
PCI\VEN_8086&DEV_27D8&SUBSYS_FF311179&REV_02\3&B1BFB68&0&D8 : Microsoft UAA Bus Driver for High Definition Audio
PCI\VEN_8086&DEV_27DA&SUBSYS_FF311179&REV_02\3&B1BFB68&0&FB : Intel(R) 82801G (ICH7 Family) SMBus Controller - 27DA
PCI\VEN_8086&DEV_4222&SUBSYS_10408086&REV_02\4&20975680&0&00E1: Intel(R) PRO/Wireless 3945ABG Network Connection
22 matching device(s) found.
 
 
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USB devices 
=========== 
 
USB\ROOT_HUB\4&10FC42FB&0                                   : USB Root Hub
USB\ROOT_HUB\4&22866BB2&0                                   : USB Root Hub
USB\ROOT_HUB\4&278559F9&0                                   : USB Root Hub
USB\ROOT_HUB\4&390F82B0&0                                   : USB Root Hub
USB\ROOT_HUB20\4&31301B64&0                                 : USB Root Hub
5 matching device(s) found.

Hows this?

I am having the same problem.  I purchased a Toshiba  P105-S6177 with Vista (which I couldn't use with my specific applications I run.
I am running XP Home and cannot get the sound to work.

Intel(R) 82801G (ICH7 Family) SMBus Controller -27A
(this device doesn't have a driver and I can't find one)
The system tells me I don't have any audio device installed.

Please help