Well If you used Forced Film in DVD2AVI then the File will be Progressive But at 23.97fps it is Not DVD compliant, All you need to do is Download either "DoPulldown" or "Pulldown.exe" But I prefer "DoPulldown", You can download it here :
http://www.dvdcreation.net/download.php?id=1860 , Just remember if you are doing a DVD rip that you should enable the Drop Frame Flag...Cheers