RealTime! Receive from network

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MFC

Hi
i have a simple application for receiving data from socket.
i have a class based on CAsyncSocket that i override a function for its OnReceive function. when the OnReceive Event raised i go and get the data.

my hardware is a board that produces counter and sends data by network. when i want to receive data, the data is missed. (i find this miss by checking counter after receive). the board generates and sends the data and i should receive it concurrently.

but when i play with the GUI, for example by clicking the title bar , the miss of data, begins.

i tried to do my receive in a thread in order to remove its dependency to gui, but i don't achieve any gain in data receiving.

is there any suggestion???

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my project is Dialog Base MFC. there is three member variables:

struct sockaddr_in m_DestinationAddress;
SOCKET m_ServerSock;
HANDLE hRecThread;

connecting to the server is done by this code. after connection, we create a thread for receiving.

void CSendReceive_LANDlg::OnButton5() 
{
	// TODO: Add your control notification handler code here
	m_DestinationAddress.sin_family		= AF_INET;
	m_DestinationAddress.sin_port		= htons(20482);
	m_DestinationAddress.sin_addr.S_un.S_addr=inet_addr("192.168.1.111");
	
	if((m_ServerSock = ::socket(AF_INET,SOCK_STREAM,0)) == INVALID_SOCKET)
	{
		MessageBox(_T("Can't open socket!"), _T("Send Receive LAN"), MB_ICONERROR|MB_OK);
		return ;
	}
	if (connect (m_ServerSock, (PSOCKADDR) &m_DestinationAddress, sizeof (m_DestinationAddress)) == SOCKET_ERROR)
	{
		MessageBox(_T("Can't connect to Board!"), _T("Send Receive LAN"), MB_ICONERROR|MB_OK);
		closesocket (m_ServerSock);
		return ;
	}

	GetDlgItem(IDC_BUTTON2)->EnableWindow();
	GetDlgItem(IDC_BUTTON3)->EnableWindow();

	// run save thread
	hRecThread	= CreateThread(NULL, 0, RecThread, this, 0, NULL);
	SetThreadPriority(hRecThread, /*THREAD_PRIORITY_NORMAL*/THREAD_PRIORITY_TIME_CRITICAL);
	SetThreadAffinityMask(hRecThread,0x8);
}

thread function is:

DWORD WINAPI RecThread(LPVOID lpParameter)
{
	((CSendReceive_LANDlg*)lpParameter)->RecLoop();
	return 0;
}

char rbuffer[5*1024*1024];
void CSendReceive_LANDlg::RecLoop()
{
	int len,rlen;

	len=5*1024*1024;

	while(TRUE)
	{
		rlen=recv(m_ServerSock, rbuffer, len, 0);

	}

}

by this method, receiving of data is better! than CSocket use. but when i play with windows (clicking, Alt+Tab, ...), receive process encounter a problem.
i guess that Windows didn't receive data for a few micro seconds and my continous stream of data is broken!!!