Sound effect driver "MaxxAudioAPO20.dll" doesn't work [solved]

Hello, everyone.

I updated CIS Premium to version 5.0.163652.1142 and sound doesn’t work.
I think CIS may block MaxxAudioAPO20.dll because Windows 7’s event viewer shows the following error:

  • System

    • Provider

    [ Name] Application Error

    • EventID 1000

    [ Qualifiers] 0

    Level 2

    Task 100

    Keywords 0x80000000000000

    • TimeCreated

    [ SystemTime] 2010-10-10T01:55:58.000000000Z

    EventRecordID 47771

    Channel Application

    Computer dynabook

    Security

  • EventData

    AUDIODG.EXE
    6.1.7600.16385
    4a5bced5
    MaxxAudioAPO20.dll
    2.2.2.0
    4916b409
    c0000005
    0000000000009f4b
    fa8
    01cb681e47c389b2
    C:\Windows\system32\AUDIODG.EXE
    C:\Windows\system32\MaxxAudioAPO20.dll
    8612811b-d411-11df-b0de-00235afd871f

In fact, I tried disabling MaxxAudioAPO20.dll in the way below and sound worked.
Control Panel → Hardware and sound → sound → “play” tab → Speaker’s property ->extensions → turn off all sound effects → OK
(maybe inexact because I use windows 7 Japanese edition and don’t know English edition)

Incidentally, CIS 5.0 doesn’t quarantine MaxxAudioAPO20.dll.
Is there a way both CIS 5.0 and MaxxAudioAPO20.dll work?

Thank you for your help.

P.S.
I found a solution.
I upgraded Realtek High Definition Audio Driver to the latest revision R252…
Now sound effect works soundly.

Thank you.