After installing Avast4 on my new laptop I notice that web browsing is impossibly slow! What's going on? Is it the initial boot scan (and can I disable that?) or has this something to do with Web Shield scanning every page I try to surf to? I'm using Netscape Navigator and DO NOT have Zone Alarm, just the regular XP firewall activated. Help! This computer is for my 72 year old aunt and I have to get things straightened out before I give it to her.