Do a google search for the U3 wiki page. They have a link to a site that shows you how to get ride of it.
The only real reason i like U3 is because i like to be able to not only carry my files, but have the program to read them also if need be. I have a few other programs i use that isn't on the U3 site that work. But it will be nice if someone comes up with an open source alternative.
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Learn to swim.
-Tool