I have managed to install and successfully use Nero 7, I know of a way to do this and have no problems.
Before any of this make sure you right click Nero 7 and make it look like:
1: Disable your internet connection from your machine (in other words unplug your Ethernet or turn off the WiFi).
2: Start your installation, follow all the steps to install.
3: Reboot if necessary
4: If this did not work then try again, but I have successully done it this way.