strange problem

i use dvd decrypter to copy the files to disc
when i use instant copy 7 to write to dvd+r and it's finisht i get the message unsupported format from my movieplayer.(powerdvd)
when i do the same with a dvd+rw it works fine.

if i use dvd decrypter to make a iso from the dvd+rw and put it an a dvd+r it play's fine to.

i made about 100 copy's with no failer but after reinstaling al program's (after crash) i can't make working copy's

anyone have an idea for what's wrong ???

i have an aopen dvdrw2412pro (dvd+rw/dvd+r)
amd athlon xp1700
i use nashua dvd+r's

bytheway after reinstalling. the movies i made that worked oke
have now green subtitels and that was white before the crash