A problem with my laptop keyboard!?

Okay, so I have no idea what's happened. I don't know if it's a setting, something wrong with the Acer ONE Netbook 531 (Black) Keyboard or something like that. What happens is some keys work, like the 'K" button or the "R" button but some don't and something else that happens is if I was to press the key "M" it would actually pop up as "ml" or something. I have no idea what is happening and if anyone does know how I can fix it, please say! I have work that I need to do but I can't do it without my computer. Thank you to anyone that helps!

I am feeling headache after reading your post.......
So sorry i can not tell you any solution i want to take rest now.