Quick question about Norton IS 2010

Hi, just got a new pc that came with NIS 2010 and have some questions :-

 

1) I haven't set a scheduled scan up yet and NIS 2010 is still on defualt settings. It's done several 'idle quick scans'. When does it do an 'idle full scan'?

 

2) I have about 22 days left on the subscription and have brought a cd with a 1 year subscription. Do I have uninstall and reinstall from the cd or can I just enter the key I have on the cd into the program already installed and if so will I lose the 20 days left on my system?

 

Thanks