Quicktime

I got Quicktime with my digital camera and I have installed it. I know this as I have watch the 15 sec videos on it, but whenever I try and watch quicktime videos it say’s I have not got it???
This all started when I tried to watch universe 2 trailer and downloaded quicktime 6. Then after 30mins or so I was doing the set-up and it suddenly just said something like “illegal operation” and stopped arggg! Then I installed quicktime 5 that came with my camera but it still says I have not got quicktime! And when I try and download quicktime 6 the internet shuts it’s self off any one know why and how to make the p.c know I have quicktime and then download quick time 6 so I can watch universe 2!?
ben

have you tried to open the vid from the porgram, i have a mac and i have to do that whenever i open my windows media files, if i just open the file it wont work.