I have a problem with the keyboard of my laptop "Acer Aspire 4520. It worked very well but I had to touch a thing and since this has disturbed the keys! In fact, the letters that are left, there are signs or numbers on the key. And when I type one of these buttons, it taps me the sign or figure, not the letter.
For example, the letter M, there is the +
In the letter K, there is the 2
And instead of typing the letters, I'm typing the number or the sign! How do I do to fix it?