Hm. Very odd issue. Did you try launching the game straight from the installation folder?
As for uninstalling, though, if you don't get the option, you can always just manually remove the game's files from your Origin games install folder.
Yes, I already tried everything I could think of or found here: starting from Origin, starting from the folder by running the exes, giving admin rights as suggested here. I also thought about just erasing everything, but I guess that would still leave the registry keys, and Origin would still think I have it installed.
