My friend has had Osu! for a little bit, but her computer crashed during a game, now she thinks it's loaded with viruses. Is it? I have my doubts, but I'm just confirming it.
Yes it is. All 71000 people who have downloaded the game are NOW INFECTED.
Yes, that was sarcasm.
Computer crashing doesn't mean you have a virus. It means your hardware or drivers are incorrectly configured. You haven't said what crash it is so we cannot help any further.