Can bestbuy get into my computer without the password?

[Leanne]

Recently, my laptop got a virus and now it won't turn on, so my dad took it back with him out of town to get it fixed. He just asked me for the password to the computer for the people that fix it. I really don't want to give it to him because I know after it's fixed, he will snoop through all my stuff and my Facebook messages and such. My computer stays logged on all my stuff even after its off. So what should I do? Do they even need to get in? Can they? Thanks!
@fola: idk maybe I was too retarded to notice that the COMPUTER WON'T TURN ON IN THE FIRST PLACE so you cant turn it on until it's fixed you idiot.
And..
@doruletz: considering that Actually, I was the one who paid for the computer but I just don't have a best buy where I live, your statement is false. And theres nothing to hide I just don't like people going through my stuff. -__-