CreateProcess(NULL, "proc.exe",NULL,NULL,false, NULL,NULL, NULL,&si,&pi);

           
            STARTUPINFO si;
            PROCESS_INFORMATION pi;
            setmem(&si, 0 ,sizeof(si));
            si.cb= sizeof(si);
            si.wShowWindow= SW_SHOW;
            setmem(&pi, 0 ,sizeof(pi));
            if(!CreateProcess(NULL, "proc.exe",NULL,NULL,false, NULL,NULL, NULL,si,&pi))
            {
                LPSTR lpMsgBuf;

                FormatMessage(
                    FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
                    NULL,
                    GetLastError(),
                    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                    (LPTSTR) &lpMsgBuf,
                     0 ,
                    NULL);
                MessageBox( NULL, lpMsgBuf, "GetLastError", MB_OK|MB_ICONINFORMATION );
                    LocalFree( lpMsgBuf );
            }