Edit DVDs
Get a real mpeg editor like Videoredo or Mpeg Video Wizard DVD. If you want to use Windows Movie Maker you must convert the dvd to mpg or avi, use vob2mpg or convert to dv-avi using Xvid4psp(open the dvd, under profile, choose dv-avi, convert).


Join DVDs
Use TMPGEnc DVD Author / Tmpgenc Authoring works, select add dvd video, select the video_ts(or the folder with the vob,ifo,bup files) folder. Click add new track, add dvd video, select the other video_ts folder. Repeat this for all DVDs.

You can also use the FREE DVDShrink but you wont be able to make any menus, use the reauthor mode, read http://www.videohelp.com/guides.php?...elect=6;30#538

Or use DVDRemake Pro, read http://www.videohelp.com/guides.php?...elect=6;30#702 or DVD2One or
DVDFab Platinum and you can keep the original menus.