Simple, trusted Kaspersky,
This review is from: Kaspersky Anti-Virus 2014, Frustration-Free Packaging (1 PC, 1 Year subcription) (PC) (CD-ROM)
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I was a user of another brand for over a decade before I discovered the ranges from Kaspersky and I've never looked back. Simple, effective and I think the best range of AV tools on the market today. A simple installation, insert CD-Rom, follow on screen prompts, enter key code and you are up and running.
A quick download of the latest signatures and this PC I am using now is happy with K-AV. No impact on processes, invisible and quietly getting on with protecting my PC.