Would someone care to educate me on Advanced Heuristics. I checked it 'on', and got some sort of warning 'not recommended for daily scans..'. I left it on anyway and performed a system scan. I then did something minor like moved my mouse and the scan stopped and the program box vanished. Had to open Nod again -- performed a scan -- no problems second time. Today I noticed that Advanced Heuristics was unchecked -- doesn't seem to remain set.