QuickTime Constantly "Not Responding"

Im trying to download videos off the internet they are at the most 5 minutes in length. One of two problems happen...1) The video will download and then just before the end it will stop and the video will freeze and I check force quit and it says its not responding...or 2) it wont even start to download and again i get a not responding message..I had just recently upgraded to QuickTime Pro and im now regretting it because before that everything worked fine. So my question is...can i uninstall and reinstall quicktime and how do i do that or is there something else wrong with my computer??
Thanx for help in advance,
Mario

What troubleshooting methods have you tried to rectify the matter? Have you tried repairing permissions & restarting? Need this info in order to avoid duplicating suggestion & the "been there, done that" senerios.
Post the link and/or URL where you got the videos from for the knowledeable users to test for you.

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