I downloaded the latest version of Kaspersky 5 Personal antivirus a couple of days ago and immediately ran into a problem. It somehow managed to block access to the Internet with every firewall I tried. I had McAfee's newest firewall installed and couldn't access the Internet using either Firefox or MSIE. Thinking maybe it was a firewall problem, I switched to ZA Pro and got the same thing. I couldn't get to any sites with either Firefox or MSIE. I even tried my Visnetic 2.2.6 and couldn't open any sites, and LooknStop and Sygate Pro. Same problem with all of them. Finally, it occurred to me that the only change on my system was KAV 5 Personal. I removed it, rebooted, and everything worked again. Has anyone else experienced this problem and do you know what happened. I tried everything I could think of and never managed to fix whatever happened. Wish I'd kept the firewall log entries but that didn't occur to me either. Just curious. Anyway, I'm back with McAfee's new firewall using AVAST again and all is well.