After updating Windows Security KB925902, you can get the following message:
RTHDCPL.EXE - System DLL Relocation unauthorized
The DLL user32.dll was relocated in memory. The application will not run properly.
The repositioning has been done because theDLL C:\WINDOWS\system32\HHCTRL.OCXC: \ WINDOWS \ system32 \ HHCTRL.OCX occupied an address area reserved for Windows system DLLs NT. The vendor supplying the DLL should be contacted for a new one.
Reasons for having this error message
It happens when you have a integrated REALTEK sound card .
This update is known to block the startup of your sound card.