WinDVD works fine for us as well. Other potential methods are:
a) If you have a TV card installed which has an S-video socket, connect a DVD player to it and use the software supplied (or Windows Movie Maker) to capture frames. Limited to analogue quality but, from a DVD, the results can be surprisingly good.
b) Some video editing softare such as ULead's VideoStudio can download DVD tracks straight off a PC DVD drive, in native digital format, and all have frame-grab features. If you look really hard, image quality is therefore somewhat better than method a).
In both cases, please note that frame res will be 720x576 pixels (i.e. not the standard 4:3 of a TV display) so will appear to be a bit tall and thin. To correct that, increase the X-axis dimension by 6.6% to turn the image into 768x576 pixels.
Please also note that simply pressing the PrtScr key doesn't work. You'll grab the window surrounds but *not* the video overlay, i.e. the piccy you want... HTH.
We've previously tried the 'zero acceleration' method with very mixed results. Pentium 4 machines sometimes work but 'iffy' image quality. Both our Core 2 Duo machines will not run a DVD with acceleration set to zero (freezes). OK on, say, WMV data files but quality still not good, certainly not as good as grabbing via VideoStudio. Any thoughts please? TIA.