Installed SB AV 2.8 Professional for two PC's fine on one of two PC's. Put Professional setup file that I downloaded from the purchase email onto a portable HD and tried to install it on another PC, but it would not install properly. Security Center Service and Scanner Service have yellow triangles and exclamation points, and options are greyed out. Before it disappeared, I saw a message that said that Microsoft could not verify the file or something like that. I thought maybe it was because I tried to install the file on a different computer than the one I downloaded it from, but I've never had that problem with anything before. Still, I thought I'd download it onto the second PC, but the link in my purchase email is now expired. It's kind of urgent to get some AV on here, lol. Would someone be able to help me? I'm stuck. Thank you!