I can never say this enough but Nero 5.5.10.0 has bigger bugs than it previous 5.5.9.17. But 5.5.9.17 is alot stabler. Deinstall 5.5.10.0 and use 5.5.9.17
When you have achieved that...try using Imgtools 0.95-99 to burn, not to create images, but to burn. Since you used Spruce Up, reallocation of files checked should work. If not, try with reallocation unchecked.
I hope this works for you.
2C
L