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I am trying to obtain a privilege in my .NET 4 C# application. This code works and the privilege is obtained successfully, but only on 64bit systems. When the same code is run on a 32bit system, the code fails at AdjustTokenPrivileges with this exception: Invalid access to memory location. (Exception from HRESULT: 0x800703E6) I've tried modifying the code to fix the issue, but nothing has been working and I am pretty stumped. Any ideas on why this fails on 32bit systems? It fails on both Windows Vista and 7 32bit, so it is a 32bit specific problem. Updated with correct code in 2022. The below code is now correct and can be used in your application. The method: public static void EnableDisablePrivilege(string PrivilegeName, bool EnableDisable) { if (!LookupPrivilegeValue(null, PrivilegeName, out var luid)) throw new Exception($"EnableDisablePrivilege: LookupPrivilegeValue failed: {Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error()).Message}"); if (!OpenProcessToken(Process.GetCurrentProcess().SafeHandle, TokenAccessLevels.AdjustPrivileges, out var tokenHandle)) throw new Exception($"EnableDisablePrivilege: OpenProcessToken failed: {Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error()).Message}"); var tokenPrivileges = new TOKEN_PRIVILEGES { PrivilegeCount = 1, Privileges = new[] { new LUID_AND_ATTRIBUTES { LUID = luid, Attributes = (uint)(EnableDisable ? 2 : 4) } } }; if (!AdjustTokenPrivileges(tokenHandle, false, ref tokenPrivileges, 0, IntPtr.Zero, out _)) { tokenHandle.Dispose(); throw new Exception($"EnableDisablePrivilege: AdjustTokenPrivileges failed: {Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error()).Message}"); } else tokenHandle.Dispose(); } Implementation: EnableDisablePrivilege("SeManageVolumePrivilege", true); PInvoke dec

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