, try this. This isn't perfect, and there must be a better way, but since you only have a couple of images to recover, it just might work:
1. Get a blank disc and put it in your burner. This disc won't be usuable when you are done with it, so use a CD-RW if you don't want to waste a disk.
2. Open Nero, and select File->Burn Image. Choose the "Track No01.nrg" image file in the file dialog.
3. Burn the image, being sure to use "Track At Once" and being sure to un
check the "Finalize Disc" option.
4. When the burn finishes and the disc ejects, just push it back in again.
5. Again select File->Burn Image, but this time choose the "Track No02.nrg" image file in the file dialog.
6. Burn this second image (to the same disc), again being sure to use TAO mode and uncheck the "Finalize Disc" option.
7. Close Nero, and open IsoBuster
8. Select the disc you just burned. You should see two sessions on it. Expand session 2
9. Right-click on Track 02, then select "Extract Track 02"-> "Extract User Data (*.tao, *.iso, *.wav)"
10. The extraction will proceed to 99%, stall for a few moments, and then an error dialog will pop up, stating that there is an unreadable sector. Select "Quit".
11. Another dialog will pop up, stating extracting was aborted, and asking if you want to delete the file. Click "No"
12. Find the file you just extracted. It will be named "Track 02.tao". Rename it to "Track 02.mpg". If you had the same luck I did, you will now have an mpeg-2 file containing the video you originally extracted from the SVCD (minus, perhaps, a couple of frames at the very end - I couldn't tell that anything was actually missing in my test)
13. Open Nero again, and start a new SVCD compilation. Drag the "Track 02.tao" file into the compilation window, then burn the SVCD to CD-R. This CD-R will be the real deal, so you can use CD-R (although you might want to practice by burning to CD-RW or yet another image file first).
I hope this works for you. And next time burn the complete image!
P.S. I used Nero 22.214.171.124 and IsoBuster 1.1