This coomputer has no optical drive so I'm using an external USB DVD burner.
This computer started with Win 7 Home and was upgraded to Win 7 Pro.
The HP recovery program that makes the DVDs is still there and the hard drive partition D: is still there.
I have written the first 2 DVDs in a set of 4. Actually I think I had to try 2 times each to get those 2.
Now I've started the 3rd DVD about 6 times and the program rejects the disks each time after a bit .. saying there was an error.