It is unable to install the audio driver on Lenovo B450.
The above symptom may occur on the following system:
1. Click the following link to download and install Hotfix drivers available for "Lenovo G430-4152" and restart the machine.http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS008617
2. After restarting the machine, it will pop up the message of new hardware found. See Fig.1.
3. And now we can install the audio driver (Click the link below to download) for Lenovo B450 as the audio device is enabled.