RTHDCPL.EXE - Illegal System DLL Relocation

Thousands of users are finding that a recent Windows security update is making new problems. After the update users that have some types of Realtek sound cards are seeing an error message that says:

“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\HHCRTL.OCX occupied an address range reserved for Windows systems DLLs. The vendor supplying the DLL should be contacted for a new DLL.”

Microsoft has issued a patch that you can find here