There could be a few different problems making the audio out of sync.
1. Bad files - Flat up, if you haven't watched these videos before you converted them, they could very well be bad quality.
2. Bad Converter - Give another converter a try. Or try a few different free ones and see how they come out best. If you really want to strive for excellence, you might want to consider buying one(Not really necessary, there's so many good free ones out, you're probably fine) Take a look at Dizzy's freeware converters list and see what others might recommend.
I have a Creative Zen myself, and it comes with quite the nifty converter that I enjoy using.
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Various Names I use:
MK1000
MattK1000
M.K.1000
M.K1000
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