Some work so far;
(DaveRo) I put them through Switch, and
(Guest3:13)then they play but still won't burn. and
(Ripov) having moved them direct to the burner I get the same 'cannot burn' message.

I really miss Nero. I had three dated copies beginning in W98 and going on to WXP and it was bulletproof. But not W7 proof. And now it is expensive.

I'll try persistence. And moving them to the laptop in case the problem is the disk drive.
Thank you.