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The file User32.dll is necessary for the correct operation of Windows. If this file is damaged, deleted, or removed, the system will no longer work correctly. If a program or a service accesses User32.dll incorrectly, the program or the service will not work correctly. Since this is a system critical file, we do not recommend that you download or tamper with this file locally on your computer. It is much more likely that the program or process you are trying to run/access is incompatible in some way with your system. Try to re-install the program, alternatively look for available updates. If this is a system error, your best option is to try a system restore to a restoration point before the issue appeared.
Reported Errors when tampered with:
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:WindowsSystem32SHELL32.dll occupied an address range reserved for Windows system DLLs. The vendor suppling the DLL should be contacted for a new DLL.