Are you sure that you really want to make on slideshow with 811 pics? If each picture displays for just 5 seconds, that is still a show, well over an hour in length!
If you have XP, you could use Windows Moviemaker to produce a slideshow (although I am not sure if it has a limit on the number of pics). Moviemaker doesn't support burning to DVD but you could save the finished movie to your HD, and then use Nero to burn.
Alternatively you could look at Microsoft's Photo Story to create the slideshow (altho', IIRC, you have to buy a plug-in to support burning to DVD.
A couple of sites for you to have a look at click here and click here