Hi there everyone

I presently have Quicktime version 5 which i cannot use as everytime I try to launch a video stream or clip it always says I am lacking some needed software. However I have now downloaded version & from the mac site and I cant even install it as it says the mac does not recognise the format of the file, which is sitting in the download manager fully downloaded at 47mb. Can anyone please help me as I am pretty new to the world of downloading and viewing.

Thanks a lot - respect from James