how can i stop my brother to open facebook account in my own computer?

[Abdullah]

my brother always open his facebook account in my computerm, and now i am getting tired of this, how can i stop him, he can't open in his own cuz he use 24/7 hotspot, and then check fb in my pc, please guide me to stop him.
abdullah
i have already a login password, and he knows it and i can't change, i just want to stop him from opening Facebook, that's it.

[Fred]

Set your login with a password he does not know and then never leave the machine logged in.

[Wullie]

Installa una password

[john]

Well you can create a password on your computer. If you are running Windows 7 fo this:
1) Click on Start
2) Control Panel
3) Users accounts and Family safety
4) User accounts
5) Change your password

Then simply fill in a password. (remember this passoword though).

Then when you are done using your computer simply logout.
And when you want to use it again just login with your password. (this is why you need to remember your password)