I have a trojan virus ony computer, and I keep having to use AVG virus scanner tofins it. Once I find it, I go to the file and delete it. It keeps attacking iTunes, so when I deleted the files, I reinstalled iTunes, and I got warnings that said the virus was Back! This means whatever is attacking my computer is still on here. What should I do? How do I remove the trojan? How do I remove the cause of the trojan?