One of my machines got this message after the recent MS07-017 update.
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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.
Microsoft has another update to fix it.
http://support.microsoft.com/kb/935448
Nice blog!