KAV is overly sensitive to remnants of uninstalled anti-virus programs like Norton. It also won't get along well with some of the other security programs you use. But it's a "classic" in the AV arena, and is worth having to monkey around with. Many of the stability problems and bugs attributed to KAV can be traced back to it's birth on your system, and who it's siblings are. The best way to get a clean install and avoid problems is to: 1) Reformat. 2) Install KAV first. 3) Install/use Bootback (or a similar program). 4) Install your firewall. Then go online to download the MS updates. Also, test your firewall in the process, to see how well KAV likes it. 5) KAV has to come first. If it doesn't get along with your firewall, use Bootback to go back in time, and try another firewall. Or just use KIS, which is what Kaspersky wants you to do anyway. 6) Install supplemental security programs one at a time, and test each one thoroughly to make sure KAV gets along with it. If there's any sibling rivalry, use Bootback to go back in time. Follow these instructions carefully, and you too can be the proud parent of a happy KAV baby. But always remember, it's temperamental, and you will have to humor it to avoid tantrums.