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If you want complete simplicity and no intervention then I recommend you try Bitdefender Free version. I tested it for a while but prefer Avast because I want more details and control, but Bitdefender Free is ideal to install and forget it is even on your PC, great protection also.
I don’t recommend other BD versions, their interface is a confusing mess, Avast is better, but not as good as Avast v7 which was excellent and should be returned for Windows 7 users as an available choice at installation.