keyboard mac book pro when some keys clicked other keys are clicked too

Hi,

Today, i had a strange behavior of my mac book 15 late 2011. when i click on some keys other keys are clicked too.

when i click on c i get c@ and when i click on v i get v$ when i click on w the volume up is clicked and when- i clic@k on n i get n-.

right arrow i get ";" and arrow up i get ":".

When i show the virtual keyboard the keys "^" an-d "`" are in orange.

Writing is very tedious. the later phrase without corrections :"writin-g is v$ery tedious".

Thanks in advance,