How can I withdraw the priority value in the window at me, he always brings to 32 for the process, and 0 for the flow of what went wrong?

TCHAR CommandLine[256] = _T("notepad ReadMe.txt");
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static STARTUPINFO tin;
static PROCESS_INFORMATION pInfo;
static DWORD exitCode;
PAINTSTRUCT ps;
HDC hdc;
TCHAR str[60], tmp[20];
int i, sum;
static LARGE_INTEGER frequency, Start, End;
static __int64 totalTime;
static DWORD thinf;
switch (message)
{
case WM_CREATE:
tin.cb = sizeof(STARTUPINFO);
tin.dwFlags = STARTF_USESHOWWINDOW;
tin.wShowWindow=SW_SHOWMINIMIZED;

break;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case ID_FILE_OPEN:
GetExitCodeProcess(pInfo.hProcess, &exitCode);
if (exitCode != STILL_ACTIVE)
{
CreateProcess(NULL, CommandLine,
NULL, NULL, FALSE, 0, NULL, NULL, &tin, &pInfo);
SetPriorityClass(GetCurrentThread(),HIGH_PRIORITY_CLASS);
// SetThreadPriority(GetCurrentThread(),THREAD_PRIORITY_ABOVE_NORMAL);
//thinf=GetThreadPriority(GetCurrentThread());

thinf=GetPriorityClass(GetCurrentProcess());
QueryPerformanceFrequency(&frequency);
QueryPerformanceCounter(&Start);

}
break;
case ID_FILE_DELETE:
GetExitCodeProcess(pInfo.hProcess, &exitCode);
if (exitCode==STILL_ACTIVE)
{
TerminateProcess(pInfo.hProcess, 0);
QueryPerformanceCounter(&End);
totalTime = (End.QuadPart - Start.QuadPart)*1000/
frequency.QuadPart;
InvalidateRect(hWnd, NULL, TRUE);
}
break;
case IDM_EXIT: DestroyWindow(hWnd); break;
default: return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
_tcscpy(str, _T("Время работы цикла в мс: "));
_i64tot(totalTime, tmp, 10);
_tcscat(str, tmp);
TextOut(hdc, 0, 0, str, _tcslen(str));

_i64tot(thinf, str, 10);
TextOut(hdc, 0, 20, str, _tcslen(str));
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default: return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}