My game isn't responding to the Keyboard

I've been playing the flash game "Mardek" for a while when it started to lag a bit, then i decided to give the computer a rest. The next day i was SURE i didn't do anything new and when i check out Mardek i found that the keys wouldn't work. When i tried other flash games they won't respond to my Keyboard as well. Only the mouse currently works with the flash games, i've tried numerous amounts of suggestions but the problem still isn't resolved.

Could anyone help me with this?

are you running the latest version of Flash Player..?

you might need to update it..