Thanks for the replies I will try Imgburn, if this works then I'll uninstall convertx and install the older version I had working on my old PC.
In response to burn speed, on my old PC I used to do 1x, worked every time. On this new burner the slowest speed is 4x so I did it at that and then it froze.
The media is cheap, but they burned 100% successfully on my old PC which was about 7 years old and had a bog standard DVD-RW burner in it, so a new LG should be able to do the job. But considering PCs are so temperamental I have ordered a 50 pack of verbatims so if in the mean time it starts burning coasters Ill burn onto the verbs.
Lastly I'll post a log file as soon as I burn on nero, still have to install it yet so may be a while finding the disc.