This is a two stage operation.
Step 1 : Get the handle of the print dialog window using the FindWindow API function.
HWND FindWindow(
LPCTSTR lpClassName, // pointer to class name
LPCTSTR lpWindowName // pointer to window name
);
Once you have the Windows handle...
Step 2 : Use the Move Window function
BOOL MoveWindow(
HWND hWnd, // handle of window
int X, // horizontal position
int Y, // vertical position
int nWidth, // width
int nHeight, // height
BOOL bRepaint // repaint flag
);