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Have not installed microsoft UAA bus driver, without this conexant can’t be installed.
This is not available on Lenovo official site, however you can download this
from hp site.
url is ftp://ftp.hp.com/pub/softpaq/sp33501-34000/sp33867.exe
This works on many notebooks including Lenovo G450.
First, install this driver, if any error is shown then ignore it, then install
conexant audio driver and [...]

Lenovo G450 Chipset Driver
Intel Chipset driver 9.0.0.1011
Lenovo G450 Sound Audio Driver
Conexant Audio Driver 3.66.9.50
Lenovo G450 Graphics Video VGA Driver (Intel)
Intel Onboard Graphics Driver 6.14.10.5002
Lenovo G450 Graphics Video VGA Driver (NVIDIA)
NVIDIA Display Driver 6.14.11.8611
Lenovo G450 Ethernet LAN Network Driver
Broadcom Ethernet Driver 11.7.2.0
Lenovo G450 Wireless LAN WLAN Driver (Broadcom)
Broadcom Wireless LAN Driver 5.10.38.14
Lenovo G450 Wireless LAN Driver [...]

Platform Notebook PC
Processor Type Intel Core 2 Duo Processor
Processor Onboard Intel® Core™2 Duo Processor T6600 (2.2 GHz, FSB 800, Cache 2 MB)
Chipset Intel 45GM
Standard Memory 2 GB DDR3 SDRAM PC-8500
Max. Memory 4 GB (2 DIMMs)
Video Type Intel® Graphics Media Accelerator 4500MHD 384MB (shared)
Display Size 14″ WXGA LED
Display Max. Resolution 1366 x 768
Display Technology Standard LED
Audio [...]