hi.. my computer runs in windows xp, intel celeron 1.80 ghz with 768 mb ram. my computer is the server in our internet shop so we plug usb drives, floppy disks, use the internet, download files here a lot. i only used kaspersky but a virus was able to get in my computer so i taught of using two antivirus programs at the same time. now, im currently running avg free 7.5.432 and kaspersky 184.108.40.2061. both are updated. sometimes KAV detects a virus and sometimes its avg. and somehow a virus was able to get in my computer so i used norton ghost to restore my system. i've read articles about using antivirus programs at the same time.and people say it's bad and not advisable. but are there exceptions?in terms of compatibility.Is running avg and KAV really bad for the computer in terms of security? what antivirus software can really protect my computer against viruses and spywares and other malicious attacks?pls help me.thanks!