Mismapped keyboard keys? How to correct them by software means

Question

Now I had a problem with my keyboard.

When I press shift and number keys, the output is different than expected.

When I press Shift plus 2, it gives me "

when I press Shift plus ;, it gives me +.

when I press [, it gives me @.

All the symbols are strangely mapped. I thought something was wrong in the keyboard routing or processor. I checked system preference -> keyboard:

Here is what I see;

So strange! Apple recognizes the wrong mapping but continues it! I want it back to normal mapping.. Is there any way to do it or actually create a software mapping so that SHIFT PLUS 2 is @ ?

Thanks Indeed this layout belongs to a Japanese Layout, obtained from http://support.apple.com/kb/HT2841: Now the question is how to remap it back to a US layout..

Answer 1

Your mac for some reason thinks you are using a Japanese JIS hardware keyboard instead of the US ANSI or European ISO. Notice the Yen key at top right. What kind of keyboard do you actually have? This note may help:

http://m10lmac.blogspot.com/2009/12/fixing-keyboard-type-problems.html

Answer 2

It might be this since you have the second input set as Pinyin-

Automatically switch to a document’s input source

Choose an input source for a document and have it used every time you work in the document until you close it, even if you switch to other documents that use other input sources in the meantime.

This option appears only when you add a second input source.

_{Chinese input sources (such as Pinyin-Simplified or Pinyin-Traditional), Korean input sources (such as 2-Set Korean or HNC Romaja), and Japanese input sources (such as Romaji, Hiragana, or Katakana, grouped in Kotoeri) include numerous options. If you added one of these input sources, switch to it, then open and search its help to learn about the options.}