I have Shaw Secure as well and I'm pretty sure it's to blame for some of the performance loss. The cost of protection I guess. Shaw Secure is essentially F-Secure which they buy from the parent company under license and provide a limited number of installs for their customers. No idea which is the 'best' AV application, but I've heard of troubles with the Norton product as well, especially on Vista. I'm still running XP. I've been tempted to wipe the HD and start over, but then it's a hassle setting up the network again, all the applications, hardware, drivers.... aarrghh.
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