Goddamn newbies!!
Actually, I'm not sure what's going on there, have you tried the TMPGEnc site, to see if there's any info there? Sounds like the plug-ins haven't been installed, you could also try
http://www.dvdrhelp.com in the tools section for TMPGEnc plug-ins.
Alternatively, stop using my guide, that method sucks and takes too damn long! (Actually, there's nothing wrong with that method, it's just very involved)
A better, quicker and much much simpler way is to use DVD2SVCD & Cinemacraft Encoder 2.5, which will encode the video in half the time and give better results than TMPGEnc as well as being able to do near perfect NTSC to PAL conversion if required.
Guide here : hxxp://uk.geocities.com/misterbarlow
Sorry I can't help more