I would strongly recommend McAfee.

I used to be a Norton loyalist a long time back, till one day my yahoo a/c got hacked into, through a trojan keylogger.
When I searched it up on the Net, it said that Norton can't detect/delete that (mebbe it does now)

So I removed it and installed McAfee. It detected and deleted the infected file immediately.

I've been using McAfee for more than 3 yrs now..........no probs at all!