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Vulnerabilities in GDI Could Allow Remote Code Execution (925902)
Microsoft Security Bulletin MS07-017: Vulnerabilities in GDI Could Allow Remote Code Execution (925902)

MS07-017: Vulnerability in GDI could allow remote code execution
Known issues
After you install this security update on a Windows XP Service Pack 2
(SP2)-based computer, Realtek HD Audio Control Panel (Rthdcpl.exe) may not
start. Additionally, you receive an error message that is similar to the
following:
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.

Update for Windows XP (KB935448)
Install this update to resolve an issue where the Realtek HD Audio Control
Panel may not start after you install security update KB925902 (MS07-017) and
security update KB928843 (MS07-008).
Download details: Update for Windows XP (KB935448)
Supported Operating Systems: Windows XP Service Pack 2

Also, then install this
Download details: Update for Windows XP (KB935448)

Then reinstall the proper HD audio codec from realtek
Realtek