I had the same question as my sp3 was being shipped. Only 2 kept standing out after going through
tons of antivirus review sites: Bitdefender and Kaspersky. Like several others here, I ended up choosing Bitdefender (Antivirus Plus 2015) and have never regretted it. I have it set on Autopilot and I don't have to do nuthin.
http://anti-virus-software-review.toptenreviews.com/)[/QUOTE]
Bitdefender is in my opinion the AV joke of the century. I bought it for both PC and SP3.After installing it was like both units were joking on a rag and Bitdefender was no help. I took it off after wasting much time. The best solution I got from Bitdefender is reduced pricing every time my account flags a reminder that I was a customer.