Writing a screen saver that plays a mpeg

[Mortis]

Okay, i have this problem with a screensaver i'm writing. Basically i want to write a screensaver that plays a video.
Then when the mouse is moved (or a key pressed) the program quits.
Everything works fine, except when the mouse is moved over the area of the video playing.
the following function doesnt get any "WM_MOUSEMOVE" callback while the mouse is over the video area
LRESULT WINAPI ScreenSaverProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
///////////////

my guess is that it might be a problem with the following
MCI_DGV_WINDOW_PARMS mciWindow;
mciWindow.dwCallback = 0L; //Here
mciWindow.hWnd = hWnd;
mciWindow.nCmdShow = SW_SHOW;

anyways, the
mciSendCommand(gwMCIDeviceID, MCI_PLAY, dwFlags, (DWORD)(LPMCI_DGV_PLAY_PARMS)&mciPlay);
function doesnt return any "WM_NOTIFY" call back or anything to the ScreenSaverProc

Any help with this would be greatly appriciated