I have tested this on a Windoze XP SP2 (fully patched). Scanned with Norton AV Corporate Edition v 10 and ClamAV 0.91.2 and both scans came back just fine, no hanging. Upon opening the file, it caused 50% CPU utilization at a constant rate. That could not be stopped until the computer was reboot. Simply closing the program wasn't enough to stop the CPU from stopping... BTW - I'm running this on a P4 with HT. Not a dual core... -- Rob