Aopen cdrw & nero problems

[Esp]

I have an AOPEN 12x cdrw and i use nero burner. Sometimes for no reason but almost always on 80minute CDr's I get this error before writing. No matter what speed i try it at.

Medium speed error
Invalid writestate
Could not perform EndTrack
Burnprocess failed at 12x (1800 KB/s)

Any idea's ?
I also tried using adaptec, cdrwin and they both say "No supported cd writers installed" why is that ?