NERO,subtitles,and resolution errors

I have some anime episodes on my PC and when I burn them to a DVD, it burns perfectly to NTSC 4:3 ratio 720x480. However, when I try to use it on my PC, the screen is stretched and it is in widescreen mode (with the black bar on top and bottom) and when I use it on my DVD player for the TV, it zooms in and the subtitles are cut-off the bottom of the screen. I really need some desperate help. Ive already ruined about 20-30 DVDs trying to figure out what Im doing wrong.