I am in deep doo-doo. I successfully installed Windows Security Essentials on my 32 bit laptop and 64 bit desktop, both running Windows 7 Home Premium. I liked its performance so much I recommended it to my brother, who is running Vista Home Premium 32 bit on his laptop. He could not get Essentials to install completely, his computer kept locking up, requiring restarts. Still could not get rid of Essentials files and folders. He is threatening to disown me and to buy an Apple computer. Any notions what might have gone wrong?