If you press your Print Screen key and then open Paint...what happens
if you type... Ctrl+V ....?
Have you tried the Vista Snipping Tool? It is more versatile than Print Screen.
Windows Vista - Activate Vista's Snipping Tool
http://www.pcworld.com/article/137099/activate_vistas_snipping_tool.html
Use Snipping Tool to capture screen shots
http://windows.microsoft.com/en-us/windows-vista/Use-Snipping-Tool-to-capture-screen-shots
(Vista Home Premium, Business, Ultimate, Enterprise)
Vista Tutorial - How to use the Snipping Tool in Vista
http://www.vistax64.com/tutorials/148532-how-use-snipping-tool-vista.html
Info on Video capture:
Vista Movie Maker can capture screen shots:
Windows Vista - Movie Maker -
Take and use a picture from a video frame in Windows Movie Maker
Windows Media Player -
Capture Pictures from DVD Movie Scenes in Windows Media Player or Real
http://labnol.blogspot.com/2005/11/capture-still-images-from-windows.html
Also the freeware VLC Media Player has a good option for video screen capture...
(FWIW...it's always a good idea to create a System
Restore point before installing software or updates)
VLC Media Player
To setup for your screen captures...open VLC and
go to...Tools / Preferences / Video button / Video
Snapshots section.
In the directory field...Browse to and select a folder
to save your captures in. (for example...you could
create a new folder on your desktop and select it)
At...Prefix...check the box...Sequential numbering.
At...Format...choose JPEG or PNG.
Finally.....left click the 'Save' button.
Now...Play the video and pause by pressing your
Spacebar when you see a screen you wish to capture.
To capture the screen...type... Shift+S
Press spacebar to advance to the next photo...
ect...etc...
Also...VLC Media Player...can record while video is playing
and will save the segment when you stop recording. This is
very useful if you need a small clip of a larger video file.
VLC 1.0 Records Video from DVDs
http://lifehacker.com/5318807/vlc-10-records-video-from-dvds