Uhg, sick

Uhgg, I'm sick. I know, sucks. I woke up and BOOM. Instant nausea. But, that's not really what this is about, does any one. ANY ONE, know how to convert videos so that you tube will upload them? 'Cause i have twelve videos that i don't know how to convert. Its very depressing. So if anyone knows, could you drop me a line??