#include "stdafx.h"
#include <windows.h>


int main(int argc, char* argv[])
{
    CreateProcess(
        _T("C:\\Windows\\SysWOW64\\cmd.exe"),
        _T("/c calc"),
    );
}
想知道是哪里出了错

遇到什么错误你不肯说说？！

另外，CreateProcess 需要很多个参数，你却只给了两个。遇到问题后你没去 msdn 看一眼它的函数原型？
https://docs.

#include <cstdio>
#include <windows.h>

int main( void )
{
    wchar_t cmdline[MAX_PATH];
    GetSystemDirectoryW( cmdline, _countof(cmdline) );
    wcscat( cmdline, L"/calc.exe" );

    STARTUPINFOW si = { sizeof(si) };
    PROCESS_INFORMATION pi;
    BOOL b = CreateProcessW( NULL, cmdline
                           , NULL, NULL, FALSE, NORMAL_PRIORITY_CLASS, NULL, NULL
                           , &si, &pi );
    if( !b )
    {
        puts( "failed to invoke CreateProcessW" );
        return 1;
    }

    WaitForSingleObject( pi.hProcess, INFINITE );
}