When I type a a; comes up if I type semi colon a; comes up if I type in l ls comes up also if I type s ls also comes up driving me mad can you please please help

My only thought is that the keyboard is malfunctioning.
Try a different keyboard to see if that is the problem.

If it turns out to be the keyboard I suggest opening it up and see if you can clean it out, maybe you spilled something on it.