Blue Screen of Death caused by SymEFA.sys (i think)

Hi all
A few minutes ago i received a Blue Screen of Death caused by Symefa.sys or something like that.
Can someone guide me through how to troubleshoot this? The computer is working fine, but i'd like to find out what caused this BSoD.

 

Im currently looking the event logger through to see if there are any hints...


Windows 7 x32 7600 fully updated (Danish)
Norton Internet Security 2011 18.1.0.37 (English)

"Disabled" Norton Ghost 15