Windows 10, Alt+Shift+T bringing up windows snipping tool instead of creating opacity keyframe

Thanks to Adobe's wonderfully effective and never problematic software, I was unable to update any of my apps until an Adobe rep took over my PC and deleted any trace of Adobe software. In this process I lost all my preferences, and somewhere in those prefs must have been some option to tell windows to give keyboard input priority to Adobe, because now when I'm working in AE and I'd like to make an opacity keyframe, I hit Alt+Shift+T, but instead my curser turns into a target that can be used to draw a window for a screenshot, using either Snipping Tool or Snip & Sketch. I tried simply changing the shortcut for those tools but I can't find those options either