How do I burn DVDs when using Nero 7 Ultra Edition
 

I need help with how I do burn DVDs using Nero 7 Ultra Edition.
Someone who can come with some suggestions.
Thanks in advance.

What kind of DVDs do you want to burn? Video DVDs? If so, then you'll need an authoring solution as well. Nero Burning Rom will allow you to burn pre-authored DVD-Video content to disc, but it won't acutally author that content for you. NeroVision Express will do a very basic job of converting AVI files to DVD, but there are better solutions. Give us some idea what you're trying to achieve.

I simply whant to make a burn an "avi" or "mpg/mpeg" file onto a CD-R (sometimes DVD-R disc when the file is larger than 700 MB) so I can be able to play it on my Playstation 2 (I can play DVDs on that, also all regions if I first use a disc called "Region X" before playing the actual DVD)

At the moment I use a CD-RW disc to experiment with, until I get the hang of it.