Problem to capture screen

[OMT]

I have a film 'week-end.wmv' made with some REIMS friends the 8 may 2009.

I play it in the XNVIEW integrated video-player and it works fine.

After this, I want to extract an image of this film so I try to made a screen capture of this film with three different manipulations:
* hit the key IMPR-SCREEN
* hit the two keys ALT + IMPR-SCREEN
* use the XNV 'capture screen' fonction ( with options >> Desktop / HotKey=ALT-F10 / Hide XNVIEW )

I canno't have a good screen capture.
The image acquired with any of these 3 manipulations is totaly full of noise and so, I can't use it.


My configuration >> XNVIEW 1.96, Windows XP-SP2, 1920*1080 with 32bits at 60 Hz

[xnview]

Yes, XnView can make capture on DirectX output