Help with my keys

[KriZerKeR]

Ok can sum please tell me how to unlock my keyboard so i can press more than 2 keys at a time. Because every other key locks up when i have 2 keys held down. How do i fix it to where i can press more than 2 keys at a time?

 

[rf6647]

Here is some reading for your pleasure! The acceptable combinations for 3-key presses is restricted.
Scancode document from Microsoft.