Hi, I've got a similar problem as Mercany did except that I'm on WinXP SP2 so his cure doesn't apply to me. To recap, there is a noticeable lag in file I/O operations such as copying, deleting, browsing, when AMON is enabled. I just switched over from Norton AntiVirus 2004 and as far as I know, NAV has been uninstalled from my system and it's directories deleted but even with it's noted resource hogginess, it was never this slow when in Resident mode (not on-demand scanning). I ran full system scans with NAV (before uninstalling it) and NOD32 (after installing it using the toughest settings on all files and advanced heuristics) but no nasties were found. I have Total Commander 6.03a (a Windows Explorer replacement) and ZoneAlarm Pro 5.5.062 running on my Intel P4 3.0G PC. Does anyone else have this problem or know how to fix it? Thanks.