Aero snap cut off half of WMP 12 video

Why does Aero snap cut off half the Windows Media player 12 video?

-dual sreen display is not on.

Example:


When i snap videos up or to the left it maximizes.

Doesn't happen to me. Try putting it in Skin mode (Corporate).

how do i do that?

From your screenshot I can see that the window is actually positioned so half of the WMP window is off-screen.

You mention dual screen display is turned off; does that mean that sometimes you DO have it turned on or have tried it in the past? Sometimes if you have a projector or other monitor the system makes it the default and the screen size may be different. Make sure the monitor you are using now is set up as your primary screen.