Hiiro, do you have any siblings?
In my post I said I have a sister.
We used to fight a lot. Then I started being nice.
It worked. She's one of my best friends.
Obviously neither of you read my post so everything Planr said is actually unimportant but I'll respond to it anyways!
I tried this years ago, it did not work. My sister is intentionally malicious at times and bugs the hell out of me on purpose.
I was put In charge of her, as I said before. Besides, I was already very busy on the computer, and I was trying to install Portal 2, I couldn't just leave it alone.
She's intentionally malicious because you're a tightass.
Let her do what she wants.
Yeah you were put in charge, stop being a tightass.
And no, installing a game is as easy as "You can use the computer as long as you don't close this window or do anything to it, deal?"