I really don't think it's the ad service. I have a couple anti-viruses on my Nook HD+ and both of them had either freaked over the Nook's Demo mode or the Crosswords preinstalled game. One said the demo mode was a virus! The other AV said that the Crosswords was malware! It's my opinion that android based antivirus apps were designed for every other device except B&N's nook devices hence the freak out over Nook software. What antivirus are you using? Most of them have an ignore list you can add your apps to if you think it's a false positive and it won't bother with them anymore.