Do you've any siblings or mischievous friends who could switch the keys? Not a clear-cut reply, but price looking into.
The only point I can suggest is numerous kind of issue with your motherboard, or whatever processes your keystrokes. Depending by whatever kind of laptop you have, try a google search with "keyboard malfunctions" and your model name // sort // etc. You can brainwave a lot of good help. I can simply extend a few vague resources, but I hope it helps!
http://www.techsupportforum.com/microsof
http://en.allexperts.com/q/Keyboard-Mous
Also try cleaning your keyboards with some compressed air.
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