From: "Rich Gauszka" 


 http://support.microsoft.com/kb/935448/en-us

SYMPTOMS

When you start a computer that is running Microsoft Windows XP with Service
Pack 2, the Realtek HD Audio Control Panel may not start. Additionally, you
may receive the following error message: Rthdcpl.exe - Illegal System DLL
Relocation

The system DLL user32.dll was relocated in memory. The application will not
run properly. The relocation occurred because the DLL
C:\Windows\System32\Hhctrl.ocx occupied an address range reserved for
Windows system DLLs. The vendor supplying the DLL should be contacted for a
new DLL.

This problem occurs when the Realtek HD Audio Control Panel (Rthdcpl.exe)
by Realtek Semiconductor Corporation is installed.

CAUSE
This problem may occur after you install security update 925902 (MS07-017)
and security update 928843 (MS07-008). The Hhctrl.ocx file that is included
in security update 928843 and the User32.dll file that is included in
security update 925902 have conflicting base addresses. This problem occurs
if the program loads the Hhctrl.ocx file before it loads the User32.dll
file.

RESOLUTION

Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended
to correct only the problem that is described in this article. Apply it
only to systems that are experiencing this specific problem. This hotfix
may receive additional testing. Therefore, if you are not severely affected
by this problem, we recommend that you wait for the next Windows XP service
pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support
Services to obtain the hotfix. For a complete list of Microsoft Customer
Support Services telephone numbers and information about support costs,
visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support
(http://support.microsoft.com/contactus/?ws=support)

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