After burning V29 I inserted it in the car DVD player. The computer would not recognise the disk. I had trouble ejecting the CD & when I eventually ejected it I had lost my previous V28 OS. I could not re-load V28 so tried V27.1 - neither would load.....
I burned the V29 disk using UltraISO so I'm now going to burn with Alcohol 120% & see what happens
Currently I have a non-working SatNav!!