Yeah I have the same issue with bitdefender free. And there is no way to add a specific adresse on my harddrive to the exclusion. So I always have to turn off bitdefender when running winminer, really really unfortunate. I guess that's the limit of the free bitdefender version.

I haven't been mining in many many years, it's nice to just have a program setup everything, instead of using cfgminer(whcih was also fun but sometimes frustrating).