My computer had both a worm and a trojan virus....had McAfee antivirus, but decided to buy and install Norton AV 2010. Tried to remove McAfee using Control Panel....it said it couldn't remove it completely. When I try to remove it with the Norton AV installation process....it says to contact the 'technical support' area...but I can't seem to find out how to do this? The Norton AV won't install until the other AV is completely out....how do I do this??