I think you need to be more specific about what you mean by 'burning movie'. Do you mean that you have downloaded an avi file and want to convert and burn it onto dvd to be played by a standalone dvd player or you just want to archive and burn the avi file(s) to dvd using your NTI software?

Also, if the NTI software comes bundled with your laptop, chances are that it is not the complete version and do not have the module that would support dvd movie burning. That's my experience with the bundled NTI software that came with my dvd burner.

You might need to upgrade to NTI CD&DVD Maker 7 from their web site here:
http://www.ntius.com/default.asp?p=cdmaker/cdmaker_main

But do note that NTI does not convert most of the avi formats (DivX, XviD, etc ) to DVD-Video format and will not burn disks that are playable on standalone dvd players. For that you would need other software like Super DVD Creator, WinAVI Video Converter, InterVideo DVDCopy 4 etc.