an easy tool to use for making vidcaps is BS player. theres many links where you can download it for free, by searching google.com
heres 1 link
http://www.videohelp.com/tools?tool=BSPlayer
Once you have the player installed, open it up.
right click on the player and then click options, then click preferences.
You can chose where you want to vidcaps to go, by clicking on
"Directory for captured images" I normally save to my desktop.
in the nex box, select JPG
in the bottom "capture file name format" box copy and past this ---> %F_%A2
This will name all vidcaps by the title on the video and aslo automatyically number them.
Hope this help's.
regards
CP.