I am looking for a good antivirus for my XP system. I had used Norton so please do not recommend that. It makes the system very slow. The XP system is used as default mailbox at my workplace. I am using Outlook Express on that and there are multiple accounts configured on the same. All mails are downloaded on it at a regular time interval. The pst folder is shared on the network and all people can view the same. Now Norton makes the system very slow. I need a good antivirus which must be better from performance point of view.