Photoshop CC 2018: Won't do anything

Photoshop CC legit won't do anything except open. I can peruse the home screen just fine for some reason, and it used to open images. But when the image opened, none of the tools would work without significant clicking, often immedietly undoing the progress made. For example, the brush tool may paint a red line, but as soon as you release the mouse, all progress disappears. It does the same with the erase tool, and select tools, I haven't tried any other tool. Now, after uninstalling and reinstalling photoshop, it won't even open anything. Just lets me tour the lovely lovely home screen for photoshop.