NIS 2010 sometimes slow to launch.

My laptop is an Acer 5738Z with Windows 7 Home Premium.A puzzling problem I have is the time NIS 2010 takes to launch.Sometimes,I have the Norton icon in the system tray as quick as 45 seconds,sometimes it takes over 100 seconds to appear.And all times in between 45-over 100 seconds.Could anyone help me to resolve.this?