ok i did closed all that apps, but it didn''t help.
can anybody say exactly how and when an device is reacquired ?
If you want i can mail you my code and you can look at it.

ok here is my code:

First the code that returns the data:

HRESULT CMyInput::GetKeyboardInput( )
{
HRESULT hr;

if( FAILED( hr = m_lpKeyboardDevice->GetDeviceState( sizeof( m_cKeyboardbuffer ),
(LPVOID) &m_cKeyboardbuffer ) ) )
{
// If input is lost try to reacquire the device
if( hr == DIERR_INPUTLOST )
{
// if the device can''t be reacquired then return error
if( FAILED( hr = m_lpKeyboardDevice->Acquire( ) ) )
return hr;

if( FAILED( hr = m_lpKeyboardDevice->GetDeviceState( sizeof( m_cKeyboardbuffer ),
(LPVOID) &m_cKeyboardbuffer ) ) )
{
return hr;
}
}

// return error
return hr;
}

return S_OK;
}

Here the code that creates the keyboard device:
( I have used the coopflags NONEXCLUSIVE and FOREGROUND )

HRESULT CMyInput::CreateKeyboardDevice( HWND hwnd, DWORD coopflags )
{
HRESULT hr;

if( FAILED( hr = m_lpDI->CreateDevice( GUID_SysKeyboard, &m_lpKeyboardDevice, NULL ) ) )
return hr;

if( FAILED( hr = m_lpKeyboardDevice->SetDataFormat( &c_dfDIKeyboard ) ) )
return hr;

if( FAILED( hr = m_lpKeyboardDevice->SetCooperativeLevel( hwnd, coopflags ) ) )
{
return hr;
}

if( FAILED( hr = m_lpKeyboardDevice->Acquire( ) ) )
return hr;

// Set Keyboard as a valid and usable Device
if( ( m_iUsedDevices & MYINPUT_KEYBOARD ) == 0 )
m_iUsedDevices += MYINPUT_KEYBOARD;

return S_OK;
}

Here ic the messageproc:

LRESULT CD3DMyApplication::MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
HRESULT hr;

switch( uMsg )
{
case WM_EXITMENULOOP:
case WM_EXITSIZEMOVE:
if( ( m_pInput->m_iUsedDevices & MYINPUT_KEYBOARD ) )
if( FAILED( hr = m_pInput->SetKeyboardAcquire( TRUE ) ) )
DisplayErrorMsg( hr, MSGERR_APPMUSTEXIT );
break;

case WM_ACTIVATE:
if( ! ( WA_INACTIVE == wParam ) && ( m_pInput->m_iUsedDevices & MYINPUT_KEYBOARD ) )
if( FAILED( hr = m_pInput->SetKeyboardAcquire( TRUE ) ) )
DisplayErrorMsg( hr, MSGERR_APPMUSTEXIT );
break;
}

return CD3DApplication::MsgProc( hWnd, uMsg, wParam, lParam );
}