I, too have had a conflict adding Kaperksy PCShieldDeluxe, which indicated a conflict with Comodo. I gather Comodo does not have a free anti-virus program for an AMD based 32 bit Vista Premium system (I have an HP dv9727us - a relatively new model HP). Does Comodo have an anti-virus for this type of machine with stated AMD chip and operating system? Do you have any recommendations for compatible anti-virus packages for this type of system with a Comodo firewall?