Can anyone tell me why this happens?

I upgraded Nero to 6302 then this started to happen so I went back to 60119 which has always worked fine but I still get this error.

I'm using Ritek discs and I've never had a problem with on the fly before.

http://homepage.ntlworld.com/phil.bellamy/Stuff/Error1.jpg

Do you get the same error message when burning an image file from your HD too?

Yes same error but also something about illegal disc too??

Strange because I can do OTF with InstantCopy8 and ISO with DVDDecrypter. Perhaps a format and reinstall is in order.