Shoutbox

To start the timer:
UINT timerID = SetTimer(NULL, 1, <delay in ms>, &TimerProc);

To kill the timer:
KillTimer(timerID);

To respond to timer events:
void CALLBACK TimerProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    // Code to respond to timer
}

Timers on MSDN