I have found Nero a bit of a mixed bag.
Whilst when it is working, no one can doubt it's effectiveness, it does seem susceptible to change.
For example, like yourself, I had a "bundled" edition supplied with a CD burner, and it operated with few problems. A little later on, I obtained a later version, loaded it, and it refused to run at all, forcing me to return to the original version. To this day, I don't know the reason for this.
The solution I am afraid, is probably to search a little harder for your original bundled version. Once found, make sure you remove the version you now have via the appropriate means. If it has it's own uninstaller, use that, if not, via Add/Remove Software. Then try a fresh install. If you still have problems, you may have to clear some remnants from the registry. More about that, if it proves necessary.