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To shut down or restart the system on NT/2K/XP, the calling process must use the AdjustTokenPrivileges function to enable the SE_SHUTDOWN_NAME privilege.

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Consider using RtlAdjustPrivilege() to adjust privileges, much easier than getting AdjustTokenPrivileges() to work

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static extern bool AdjustTokenPrivileges(IntPtr TokenHandle,

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static extern bool AdjustTokenPrivileges(IntPtr TokenHandle,

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Private Function AdjustTokenPrivileges( _

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Private Function AdjustTokenPrivileges( _

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Declare Function AdjustTokenPrivileges Lib "advapi32.dll" (

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    internal static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall,

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        retVal = AdjustTokenPrivileges(htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero);

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             if (NativeMethods.AdjustTokenPrivileges(tokenHandle, false,

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               throw new InvalidOperationException("AdjustTokenPrivileges failed.", win32Exception);

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            throw new InvalidOperationException("AdjustTokenPrivileges failed.", win32Exception);

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      internal static extern bool AdjustTokenPrivileges(IntPtr tokenhandle,

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    Private Function AdjustTokenPrivileges( _

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            If Not AdjustTokenPrivileges(hToken, False, newState, Marshal.SizeOf(prevState), prevState, returnLength) Then

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                 "AdjustTokenPrivileges failed with error " & lastWin32Error.ToString & ".")

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Documentation

[AdjustTokenPrivileges] on MSDN!