Hmm ok. Try downloading the trial for Advanced Uninstaller pro here
It's quite simple to use and try to uninstall everything labled Nero if it shows up. If it don't, then I want you to try this...
First in Advanced Uninstaller open the startup manager and disable or remove this if possible: NeroFilterCheck.
That should keep Nero from starting up at all and I'm pretty sure you simply can delete the installation folder now. When that is done, open the registry section and scan because you will now have things in your registry that points to invalid locations on your drive.
(If you get any errors while deleting the folder, try rebooting and turning off any write protection from the main and any subfolders+files.)
I hope this works for you mate if you try it. Good luck.