I am having trouble with my keyboard not responding when I press & hold 3 or more keys at once. I have researched it and it's called Phantom Key Blocking.
Phantom Key Blocking means that when two or more keys are depressed simultaneously, many of the other keys on the keyboard will not respond until one of the three depressed keys is lifted. This happens when I hold up+left+spacebar when I want to circle a station to kill it. It is really annoying and means I can't fire missiles or quickly readjust my route without letting go of keys. Which really screws me up.

This is 1 of the websites I stumbled upon that explained it a little. This guy's buddy had kind of the same problem.
http://clanblackwatch.com/showthread.php?t=419
I don't have any of those accessibility options enabled so it can't be those. (Toggle keys, Sticky keys, etc.)
Anyone had this problem or know how to fix it? I fear that it is just my keyboard bcuz alot of cheap ones and even some expensive ones have this problem. My keyboard is a stock one that came with my 3 year old E-Machines computer.