So I installed Windows Defender in place of MSAS, and tinkered with it a little. The first time, I didn't bother to uninstall MSAS, and installed Defender in it's place. I noticed Defender's icon disappeared after it finished updating, so I thought maybe it was a bug due to not removing MSAS first. So I uninstalled everything, then re-installed Defender. Now it won't update itself, because it thinks that it's already updated for some reason. I suspect there's some registry setting that's telling Defender it's updated when it's not. I don't know where to begin to look for that though. Any help greatly appreciated!!!