AutoGK (Auto Gordian Knot) Download
This program puts the VOB files onto your hard drive, and in the process breaks the encryption and Macrovision protection which DVDs have, and which is illegal in many countries. You'll have to get it and install it yourself.
But the AutoGK Installer will install everything else that you need. Just designate a folder for the installation, and everything will be taken care of. Optional programs include the XviD Encoder, AviSynth, and VobSub.