Quick Scan-TOO SLOW!!

Hi Just downloaded the New version NIS 2012 and Nortons going backwards and not forward. Running Quick Scan now takes forever to complete,. over 10 minutes unacceptable were when i was using 2011 took under 3 minutes if that… should change the name from quick scan to slow scan because its sure not quick… Using Windows 7 How do i go back to the better version NIS 2011? Please fix…