Agree with markysngc.
Many nasty people on the internet use limewire and similar programs to distribute viruses.
The give the impression it is the genuine product, but it is in fact the product code with a virus hidden in it.
You unpack and install Nero, and at the same time it installs a keylogger for example.
A keylogger makes a note of everything you type into your computer and sends it to someone else.
That information could include userids and passwords, credit card numbers and so on.
It may sound a bit dramatic, but that is the sort of thing that goes on.
You say you are a complete novice, well dont risk it.