If you're trying to put several files together, you need a program like VideoMach. This porgram does NOT support NSV but will do this in either MPEG or AVI format. Take the file you make with VideoMach (which you can get from Download.com), and run THAT through NSVenc.
Do this for EVERY video you want encoded.
Once you've encoded all of the batched files as NSV videos, MAKE A PLAYLIST. This will have to be done WITHIN WINAMP. As such, it will be easier if you put all of the batched videos into ONE directory and then save the PLAYLIST file into THE SAME directory.
If you want them shuffled and to repeat, just make sure both SHUFFLE and REPEAT are checked within Winamp.
From there, you shouldn't have any problems if you've been following the forum.
Hope this helps