powerdvd and FZ, xvids and vista

As some of you might know, ripped dvds can't be played as is on vista. If u got v premium, then u can twick the mediacenter to play them, but if u don't have mediacenter, like if u got vista biz only, then u need to get a 3rdparty prog. After some googling, people recced powerdvd, so I got that, and it played ripped dvds-- except...

90% of time, though, dvds play really slow, more like a slideshow than a movie. So, is this a vista problem? I don't know, but I don't think so.

I also have gom, and dvds play fine on gom. It's just that gom's so barebone compared to powerdvd.

What can I do to make dvds play more consistently on my FZ (2gb ram, 1.06 mhz U7500, 4200 rpm HD, Intel 950 graphics)?

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Also, there's this really annoying thing playing back AVIs. I have gom and vlc, which let me play pretty much every format. And so they do, except this one thing. Every time I try to play AVIs, these stupid error signs come up, saying "core xvid.dll not found". This pops up like rabbits breeding, and sometimes crashes my explorer, prompting a restart.

The thing is, the actual AVIs play fine. There's no problem at all in watching them, except these annoying warnings keep popping up. What do you think is the problem?