Keyboard Problem, Keys F1, W, S, X and CAPS LOCK NOT WORKING

Hi to all Windows users.

Problem:

Problem started within VirtualBox app.
First, my both ALT keys were locked.
BUT I found out were problem was.

Pressing BOTH CTRL, BOTH ALT and BOTH SHIFT keys unlock ALT keys.

BUT new problem occurs.

Now keys F1, 2, W, S, X and CAPS LOCK not working.
I don't know what to do and this "on screen kb" i killing me.

I'm gonna try another kb today and I'll pot results later.
My kb is on ps/2 connector and model is Genius KB220.

Yes, that would be a malfunction of my kb.
I've tried another one and another one is working properly.
THANKS.

Lock, please.