Yes, Nero does have a habit of trying to take over one's computer. (Almost a bad as some of the HP apps.
.) Another of those 'background indexing' things, which can be useful if you want to use Nero to find your stored images - but I don't.
The first thing I did was to stop this particular app from starting: the usual <start> <run> msconfig will contain - probably - a couple of Nero-derived background programs, both of which slow down the 'puter. Either delete them or disable them, and restart the computer. Then at your leisure you can find the the folder in which the Nero index is stored and lose that also. Or I guess you could just leave it be: it won't do any harm.
Edited to add: I didn't do anything to start this process up, SD, Nero did this all by its little self.