The other note "Notes.txt" contains a clue about the password to unlock the button (tip: look at the wall outside the pc). You can't exit the pc until you correctly press the button or open "Nothin important.txt". Tell me if you need more help :)
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Lol, even with your tips I still spent 30 minutes figuring out what I need to do. First I tried looking on the wall before entering computer, then I tried pressing arrow keys, then WASD then retrying it for 10 times. And after that I figured out that there are numbe on the walls. To be honest, those type of numbers are used veeeeery rarely in my country. Thank you so much for helping me! And I'm sorry for asking so many questions.