I put together a couple of files to rip DVDs.  In here you can use DVD2AVI to try and capture your divix movies. 
Get the file here
http://www.landi.net/jim/files/dvd.zip
once you have it installed,  There is a bug in the screen capture part.  just change color dept in one of the menus. Does not matter what. You can then press B to grab a frame.  
If you have problems let me know