So, yesterday I was at a friends house, I played osu! on a laptop there and took my external drive with me, on which osu! is installed. Today I plucked it into my PC at home again, and as soon as I opened osu!, the updater went on and off constantly, flashing, sometimes switching between searching for update and game is being updated. It looks like the program constantly starts and closes again. I tried to reinstall it and same thing happens, I can't even quit that mess without plucking off the drive or signing out.