Saw its stuck(Not-responding),I tried it several times its not workings,I repaired it.Still not.
What do i do?
no you wont, if you UNINSTALL steam, the steamapps folder remains, as it has all the games. just copy this somewhere, if you are paranoid
got it a bit wrong.

That's common. Just cancel and click play again if it takes too long.
Turn off Internet, then double click steam and play