Hi, is it possible to convert or improve AVI files to a high quality format and so improving the video quality on it? if so what tools are needed for this?
Thanks.

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If you do conversions, there will lose quality more or less. I've never heard any tools that can improve video quality after conversions.

Depending on your definition, it's not really possible to improve the quality of the video in a basic sense, as you can only work with what data presently exists and any further lossy video compression will only further lessen the quality. 'Garbage in, garbage out' as they say. Now you CAN apply filters to the video to alleviate the effects of certain problems that exist in the video such as applying filters to lower noise/grain levels, macroblock lowering filters, light/dark/contrast/color filters, etc. But in doing so you are trading off some of the original accuracy and details of the original file. In some cases it's worth it though, for example in trading off some detail and further softening of the picture by filtering out heavy macroblocking.

As far as converting avi to dvd and/or visa versa, what is the best software available for both?! Either amateur and/or professional? Thanks

Ja-Mon!
If you go to www.videohelp.com you will find tools, and forums which discuss these very issues. I COULD tell you what to get, but other peoples opinions are different than mine. It's best to read a bit, download a few trial programs, and see what you like, and what works for you.