how can i fix my advents 7103 laptop keybored?

heyhey! I know before you say it "don't buy second hand laptops" but i'm broke. so the enter key was a little non-responsive at first but now its failed on me compleatly. I've tryed to reset it i've pulled it up and another to compare and all good there. i've loved it i've thretend it i've ignored it the dam things more stubborn than me! it's an advent laptop 7103 oh and non of my short cut buttons (vol etc) work either. Please please please can some one help me thanks, ria.