You just need to get a video converter program which will make 3GP format movies for your device. A good free one is at
MediaCoder - more than a universal audio/video transcoder.
After ripping the DVD, just transfer the output 3GP file to your SD card video folder and now you can play those movies. Don't bother with the download stuff. Most of it is a waste of time with junk, viruses, trojans, and who knows what else. Homebrewed is always much better.
I would also suggest a really good virus scanner (Avast - freeware) and spyware remover (superantispyware - freeware) program since you may already have issues from visiting those sites already.