It most likely is the laptop that is some how damaged.
About three weeks ago, a friend had a very similar problem - pressing n
came out as nnnnnnnrrrrr
(no idea if that is the same place on qwerty as on Danish layout?).
I bought a replacement and spent time replacing it, only to discover the new one did the same.
I have no idea what is wrong, but I am almost certain that it is a manufacturing problem at Acer.
My friend uses an external keyboard through USB that works fine - if not a bit annoying.
(The worst thing was, this was out of warranty - when it was still in warranty, my friend sent it back for a different problem relating to audio - they sent it back with the username "ownnnnnnnnrrrrer" or similar - basically, they tried to type "owner". I have no idea why they didn't spot it, and then as by then it was out of warranty, they refused to fix it...)