This is becoming a common problem with HD audio...just search for "sigmatel" and you see what I mean.
In order to better help you, we need you to post your HWID's (use the link in my signature).
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PCI devices
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PCI\VEN_104C&DEV_8039&SUBSYS_81EF104D&REV_00\4&6B16D5B&0&18F0: Generic CardBus Controller
PCI\VEN_104C&DEV_803A&SUBSYS_81EF104D&REV_00\4&6B16D5B&0&19F0: Texas Instruments OHCI Compliant IEEE 1394 Host Controller
PCI\VEN_104C&DEV_803B&SUBSYS_81EF104D&REV_00\4&6B16D5B&0&1AF0: Mass Storage Controller
PCI\VEN_8086&DEV_1092&SUBSYS_81EF104D&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_81EF104D&REV_03\3&B1BFB68&0&10 : Mobile Intel(R) 945GM/GU Express Chipset Family
PCI\VEN_8086&DEV_27A6&SUBSYS_81EF104D&REV_03\3&B1BFB68&0&11 : Mobile Intel(R) 945GM/GU 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_81EF104D&REV_02\3&B1BFB68&0&FA : Intel(R) 82801GBM/GHM (ICH7-M Family) Serial ATA Storage Controller - 27C4
PCI\VEN_8086&DEV_27C8&SUBSYS_81EF104D&REV_02\3&B1BFB68&0&E8 : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C8
PCI\VEN_8086&DEV_27C9&SUBSYS_81EF104D&REV_02\3&B1BFB68&0&E9 : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C9
PCI\VEN_8086&DEV_27CA&SUBSYS_81EF104D&REV_02\3&B1BFB68&0&EA : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CA
PCI\VEN_8086&DEV_27CB&SUBSYS_81EF104D&REV_02\3&B1BFB68&0&EB : Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CB
PCI\VEN_8086&DEV_27CC&SUBSYS_81EF104D&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_27D6&SUBSYS_00000000&REV_02\3&B1BFB68&0&E3 : Intel(R) 82801G (ICH7 Family) PCI Express Root Port - 27D6
PCI\VEN_8086&DEV_27D8&SUBSYS_81EF104D&REV_02\3&B1BFB68&0&D8 : Microsoft UAA Bus Driver for High Definition Audio
PCI\VEN_8086&DEV_27DA&SUBSYS_81EF104D&REV_02\3&B1BFB68&0&FB : Intel(R) 82801G (ICH7 Family) SMBus Controller - 27DA
PCI\VEN_8086&DEV_27DF&SUBSYS_81EF104D&REV_02\3&B1BFB68&0&F9 : Intel(R) 82801G (ICH7 Family) Ultra ATA Storage Controllers - 27DF
PCI\VEN_8086&DEV_4222&SUBSYS_10508086&REV_02\4&2803E7C1&0&00E2: Intel(R) PRO/Wireless 3945ABG Network Connection
23 matching device(s) found.
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USB devices
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USB\ROOT_HUB\4&1B05E4FD&0 : USB Root Hub
USB\ROOT_HUB\4&209F9437&0 : USB Root Hub
USB\ROOT_HUB\4&23B8C14A&0 : USB Root Hub
USB\ROOT_HUB\4&296C3174&0 : USB Root Hub
USB\ROOT_HUB20\4&1A0DFFDF&0 : USB Root Hub
USB\VID_045E&PID_001C\5&1A23DCD8&0&2 : Microsoft Integrated USB Hub
USB\VID_045E&PID_002B\6&8AD4AC5&0&1 : Microsoft Internet Keyboard Pro Composite Device
USB\VID_045E&PID_002B&MI_00\7&1DEDDB01&0&0000 : Microsoft Internet Keyboard Pro
USB\VID_045E&PID_002B&MI_01\7&1DEDDB01&0&0001 : Microsoft Internet Keyboard Pro Hot Keys
USB\VID_046D&PID_C510\5&13E47B6E&0&1 : USB Human Interface Device
USB\VID_054C&PID_0281\F0000027E02B : USB Mass Storage Device
USB\VID_05CA&PID_1836\5&26F8F4DB&0&8 : USB Composite Device
USB\VID_05CA&PID_1836&MI_00\6&D2A44F&0&0000 : USB Video Device
USBSTOR\DISK&VEN_SONY&PROD_USB___HS-CARD&REV_4.52\F0000027E02B&0: Sony USB HS-CARD USB Device
14 matching device(s) found.
any help is appreciated...i have same machine and problem
thanks