ADI 1981B also know as Soundmax audio or also AC97 audio drivers. This device used mostly during windows XP era and start to slow down after vista was released. Later on after Windows 7 and Windows 8 arrival we can see that Realtek and IDT High Definition Audio conquer the audio device component in most laptops and desktop board
Windows 7 Drivers:
There are several ways to install ADI Soundmax drivers in windows 7.
1. Latest driver from Realtek (realtek AC'97 is compatible with Soundmax AC'97).
Go to www.realtek.com.tw . Select Downloads - AC'97 Audio Codecs Software - Accept the terms and agreement and select Vista/Win7 (32/64 bits) Driver only (ZIP file). Download the file, extract it and run setup to install.
2. Use your original windows XP and Windows Vista Drivers.
Windows Vista drivers for windows 7 : You just need to download your original windows vista drivers, set the compatibility for windows vita first before installing the drivers. To learn how to set the compatibility mode you can read here.
Windows XP driver : You need to install it manually using device manager. You can read the example form my post here where i wrote down details instruction to install it on HP DV4000 model.
3. The last is to mod the inf file, this is advance method but not too complicated. I write a details instruction on this method to install conexant audio and the method can be applied to install ADI audio. You can read it here.
4. Here is several driver released for windows 7:
Adi Soundmax Version 6.10.01.6230 3.76MB : Download (lenovo release)
Adi Soundmax (original release for adi 1984) : Download (Hp release)