My graphics card build-in(intel 945GCNL mother board).After installing windows 7 built 7620 i found out that my graphics card driver is not installing.
Then i downloaded a new official driver for windows 7 from intel website.

Now, while i run maya, everything goes fine, till that time i render sth and try to close the render window.
The problem is maya gets irresponsive at that time.After some time everything come back to normal except the viewport window.I can move my camera(because the mouse pointer and camera location changes).I can create objects.But still i see the render window floating above everything and nth changes in the viewport.It is like watching a video while the audio is playing as it was supposed to but video is still in the frame one.
Some times this problem occurs while im loading a new file.

I am facing same kind of problem while using blender.The only difference is after pressing the X button in the render window the box disappears keeping a black shape where it was....and blender halts!