"no audio output device is installed"

CPU : AMD Turion 64 X2 TL-60 ( http://vga.pe.kr/3dp/chip.php?driver=amd_cpu_907 )
Motherboard : [HP Pavilion dv2700 Notebook PC] NVIDIA GeForce 7050 / 7025 ( http://vga.pe.kr/3dp/chip.php?driver=nvidia_mb_a4_907 )
GC : NVIDIA GeForce 7150M ( http://vga.pe.kr/3dp/chip.php?driver=nvidia_mo_gc_907 )
Ethernet Card: NVIDIA Ethernet ( http://vga.pe.kr/3dp/chip.php?driver=dp_net )
Ethernet Card: Broadcom BCM430G WLAN ( http://vga.pe.kr/3dp/chip.php?driver=dp_net )

Memory : 2.94GB

O/S : Windows 7 Professional 32bit

3DP Chip (http://www.3dpchip.com) - Chip Ver.110818

original OS was xp but I changed to window 7. right after I did window update, i got no sound with red "X" at speaker on right bottom corner. it says "no audio output device is installed". as far as I know, I need to install "conexant hd audio output driver"

I've been trying to sort this out but so far there is no solution. I've done almost everything.

if anyone knows about this issue and has perfer solution. please let me know. i've spent too much time on this.

tactionism@hotmail.com

Thanks,