Follow Start > All Programs > DVDVideoSoft > Programs > Free Video to JPG Converter or just click the DVDVideoSoft Free Studio icon on the desktop.
The interface is rather simple and self explaining.
Click the upper Browse... button to select an input video file(s) on your computer.
Click the lower Browse... button. Choose the location where you would like to save your snapshots. Click Ok.
Set the video frames you want to save as snapshots.
For example you can extract every hundredth video frame, frames in every 10 seconds, total 50 frames or even every frame.
Note: Be carefull with the "Every frame" option. The total size of the extracted images may be several times bigger than the input file size!
Click the Extract button and wait images to be extracted.
Note: Before clicking the Extract button you can set to turn off computer after the process is completed. Just go to Options... and make sure the appropriate box is checked.