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QProcess::startDetached("shutdown -s -f -t 00");

-s - stop (для рибута - -r);
-f - force;
-t - time (кажись, в секундах);
00 - количество того самого тайма, второй ноль - видимо, очепятка (для "неотменяемой" операции "прямо щас" достаточного одного).

bool Reboot()
{
DWORD Res=0;

IWbemLocator  *locator=NULL;
IWbemServices *pSvc=NULL;
IWbemClassObject *object=NULL;

COAUTHIDENTITY *userAcct=NULL;

Res=CoInitializeEx(0,COINIT_MULTITHREADED);
	
	if(Res!=NO_ERROR)
	{
		qDebug()<<"Error CoInitialize";
		return 0;
	}
	Res=CoInitializeSecurity(NULL,
						 -1,
						 NULL,
						 NULL,
						 RPC_C_AUTHN_LEVEL_DEFAULT,
						 RPC_C_IMP_LEVEL_IMPERSONATE,
						 NULL,
						 EOAC_NONE,
						 NULL
						 );
	if(Res!=NO_ERROR)
	{
		qDebug()<<"Error CoInitializeSecurity";
		return 0;
	}

	Res=CoCreateInstance(CLSID_WbemLocator,
					 NULL,
					 CLSCTX_INPROC_SERVER,
					 IID_IWbemLocator,
					 (LPVOID*)&locator
					 );
	
	if(Res!=NO_ERROR)
	{
		qDebug()<<"Error CoCreateInstance";

		CoUninitialize();
		return 0;
	}

	Res=locator->ConnectServer(_bstr_t(L"\\\\server\\root\\cimv2"),     //вместо server - имя удаленного компа или его IP
						   _bstr_t(L"Admin"),   //логин
						   _bstr_t(L"1"),       //пароль
						   NULL,
						   NULL,
						   NULL,
						   NULL,
						   &pSvc
						   );
	
	if(Res!=NO_ERROR)
	{
		qDebug()<<"Error ConnectServer";
		locator->Release();

		CoUninitialize();
		return 0;
	}

	userAcct=new COAUTHIDENTITY;
	ZeroMemory(userAcct,sizeof(COAUTHIDENTITY));

	QString *login = new QString("Admin");							//входные параметры
	QString *password = new QString("1");

	std::wstring log = login->toStdWString();
	std::wstring pas = password->toStdWString();

	userAcct->User = (USHORT*)log.c_str();
	userAcct->UserLength = login->length();

	userAcct->Password = (USHORT*)pas.c_str();;
	userAcct->PasswordLength = password->length();

	userAcct->Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;

	Res = CoSetProxyBlanket(
						pSvc,                           
						RPC_C_AUTHN_DEFAULT ,      
						RPC_C_AUTHZ_DEFAULT,           
						NULL,						   
						RPC_C_AUTHN_LEVEL_CALL ,		   
						RPC_C_IMP_LEVEL_IMPERSONATE,    
						userAcct,                       
						EOAC_NONE    
						);
	
	if(Res!=NO_ERROR)
	{
		qDebug()<<"Error CoSetProxyBlanket";
		pSvc->Release();
		locator->Release();

		CoUninitialize();
		return 0;
	}

IEnumWbemClassObject *pEnumerator = NULL;
Res = pSvc->ExecQuery(_bstr_t(L"WQL"),
					  _bstr_t(L"SELECT * FROM Win32_OperatingSystem"),
					  WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY,
					  NULL,
					  &pEnumerator);

	if(Res!=NO_ERROR)
	{
		qDebug()<<"Error ExecQuery";
		pSvc->Release();
		locator->Release();

		CoUninitialize();
		return 0;
	}

	Res = CoSetProxyBlanket(
						pEnumerator,                          
						RPC_C_AUTHN_DEFAULT ,    
						RPC_C_AUTHZ_DEFAULT,            
						NULL,						    
						RPC_C_AUTHN_LEVEL_CALL ,		   
						RPC_C_IMP_LEVEL_IMPERSONATE,    
						userAcct,                       
						EOAC_NONE    
						);

	if(FAILED(Res))
	{
		pEnumerator->Release();
		pSvc->Release();
		locator->Release();
		CoUninitialize();

		return 0;
	}

IWbemClassObject  *System = NULL;
ULONG Returned = 0;

Res = pEnumerator->Next(WBEM_INFINITE,
						1,
						&System,
						&Returned);

if(Res != NO_ERROR)
{
	pEnumerator->Release();
	pSvc->Release();
	locator->Release();
	CoUninitialize();
	
	return 0;
}

VARIANT var;
ZeroMemory(&var,sizeof(VARIANT));

Res = System->Get(L"Name",0,&var,NULL,NULL);

if(Res != NO_ERROR && var.vt != VT_BSTR)
{
	System->Release();
	pEnumerator->Release();
	pSvc->Release();
	locator->Release();
	CoUninitialize();
	
	return 0;
}

QString name(_com_util::ConvertBSTRToString(var.bstrVal)); 
QString objPath("Win32_OperatingSystem.Name=\""+ name +"\"");

objPath.replace(QString("\\"),QString("\\\\"));

Res = pSvc->ExecMethod(_com_util::ConvertStringToBSTR(objPath.toStdString().c_str()),_bstr_t(L"Shutdown"),0,NULL,NULL,NULL,NULL);

if(Res != NO_ERROR)
{
	SysFreeString(var.bstrVal);
	System->Release();
	pEnumerator->Release();
	pSvc->Release();
	locator->Release();
	CoUninitialize();
	
	return 0;	
}

SysFreeString(var.bstrVal);
System->Release();
pEnumerator->Release();
pSvc->Release();
locator->Release();
CoUninitialize();

return 1;
}

#include <windows.h>
#include <comutil.h>

#define _WIN32_DCOM
#include <comdef.h>
#include <Wbemidl.h>

#pragma comment(lib, "wbemuuid.lib")