Asus G73JH - Gaming Problem

I have a problem which is REALLY annoying.. someone please help me..
Got my laptop on Wednesday, bought Battlefield Bad Company 2 yesterday.. and sadly.. EVERY times i play, i got some kind of error.

My game get out of Full Screen, there's a little window that appears and every letters i press goes in the box (window) and shows some random signs...

I close the window, go back full screen, as soon as i press a letter, box appears again.. and i cant play anymore.. unless i close the game.. and reopen it..
I tried uninstalling the game many times and reinstalling it.. i always get the same problem..
and it does that only with letters.. I have no problem with digits 1-9 or space bar.. someone.. please help me..

 

I had this issue and I fixed it. What you need to do is rightclick on the keyboard icon on your taskbar. Click settings > General Tab > Click on any Installed Services that are not English or the language your keyboard is native in and click remove. Apply and OK.

EDIT: It's a matter of your keyboard shortcuts switching the language of your keyboard to something not native and then BF BC2 seems to not understand the inputs.

EDIT2: Attached your own screenshot with my edit to demonstrate where the exact problem is. See how it is CH? That is because your keyboard is in Chinese language at the moment - you need to get rid of that from your keyboard options with my above steps.