I ran a scan last Wednesday (the 12th). ZoneAlarm Pro reported the following bug: "Win32.Trojan.Generic.85510".
It was in this file:
As you can see the file is in the folder of the updating software for Norton SystemWorks 2005.
I scanned with Spybot Search & Destroy, Spysweeper and Norton antivirus - they reported nothing.
Is this a false positive?