Need Help With Registeration Key

I had a virus on my pc so I removed all of my items of the desktop and reset the pc back to default settings.Before I did that I saved my liscens key for any dvd and clone dvd on cd .The problem I am having is getting back on the pc without the trial version. How do I restore it using my liscense key which I already have paid for ? Someone please help !

Download and install the trial versions, then double-click on your license key on the cd to register them.

I just did what you said it worked perfectly.Thank so much