Y'all,your cd/dvd must be pirated. A normal disc(non pirated) won't require you to unplug your cd-rom and would has a usable cd key. If you want to try, use google to seach using google.

But be sure to update your antivirus software and spybot remover first. However your disc is non-pirated, go to its homepage for customer support or simply consult the one who sold you those crappy disc.