Long boot time..minifilter?

I am running Norton Internet Security 2009.
My boot time has increased recently.  A friend suggested that I check the system event log.  It seems there
is a nearly 15 min gap between when I get the log for the minifilter and the log for the next event.
8:41:20 AM Symantec Antivirus minifilter successfully loaded.
8:55:51 AM The Logitech LVPr2Mon Driver service was successfully sent a start control.
Any idea of what might be going on.