In China, everyone is a hacker it seems like, and the viruses run wild. I can't keep up with all of them. The best one for my money
is probably Mcaffee, but they sting you on upgrades and such, but probably same as norton, except norton slows your system down, and is very hard to remove, it also comes on in the middle of things and tends to disrupt what your doing. Try McAffee and see what happens
I'm not sure of the others listed, but I will try them and see what happens.