I just downloaded PSO and got it running on my laptop, and I wanted to put it on my household's other laptop so that a younger sibling could play along with me. It works fine on mine, but when I hit "Start Game" on the launcher on my siblings' laptop I get that security warning, give it permission to run, and then nothing happens. I don't get a failure/error message, the game doesn't start running, just nothing. Their laptop is actually more powerful than mine and I can run the game fine so it can't be an issue of power, but it might just be incompatible (their laptop is a Toshiba Satellite C855-S5123). I'm not quite sure what the issue is, so I'd appreciate any help someone can offer about getting it running, or even just a concrete "no it won't run PSO," so that I can give up on it.