Win 7 OS installed 32bit, ok i've had 2 lockups of my browser this morning since installing free zonealarm late last night. ZoneAlarm 9.1.007 was the version installed. I'm using explorer 8 from a fresh install. My system been working fine ever since the install of win 7 that was 6 days ago. I'm also using Microsoft Security Essentials, so i''ll see how it goes on from now. oh i also restored my system to a point where zonealarm wasn't installed that was yesterday afternoon.