Hi, my younger sisters and brother share a computer. On my brother's account, minecraft runs fine and has no issues. But on my sisters' accounts, minecraft will not run at all. They tried several versions, but it always does the same thing. Even with optifine. One of them logged in to their minecraft account on my brothers computer account and it worked fine, confirming that her minecraft account isn't the problem, her computer account is. If anyone knows why this is happening, please tell me.
P.S. When my sisters try to run minecraft, the launcher, after loading, disappears and pops up another launcher-looking window that looks like this:
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There comes a man, in a life, when a time and he's not proud. -Presonplayz 2017