my japanese macbook pro (late 2011) physical keyboard does not match with the on screen japanese keyboard in windows 8.1 so does caps lock

This implies the on-screen keyboard does not reflect the physical keyboard correctly.

Run the same test with an external keyboard. Connect the external keyboard, use the on-screen keyboard to turn on Caps Lock on and off and check if the external keyboard works or not. If it does, the internal keyboard is not sending the correct codes to the Keyboard controller.

If you have the USB which was used to install Windows on your PC, you can check the drivers, if they support it.

Can you also look at OSX Mavericks: Kotoeri Japanese input method sometimes appears to generate incorrect characters - Apple Support.

Loner T wrote:

Can you also look at OSX Mavericks: Kotoeri Japanese input method sometimes appears to generate incorrect characters - Apple Support.

That problem was fixed in 10.9.1

http://m10lmac.blogspot.com/2013/12/mavericks-update-fixes-japanese-input.html

Usually Apple does not break stuff in subsequent releases, but assuming OP is on Yosemite, it may be worth checking.

It is interesting that setting Input methods on the OSX side updates NVRAM which impacts Windows. You can look at the following Modifier Keys as well.

Tenadona wrote:

I am using windows 8.1 pro on my Japanese macbook pro (Late 2011) and enabled japanese language but the problem is that when i press caps lock (lower left corner) it changes the input method from english to japanese.

Have you already seen the last posting in this old thread?

How do I properly install the Japanese Keyboard layout on Windows 7 x64 (Macbook Pro)

and this one

http://adamukun.tumblr.com/post/50159898648/setting-up-a-japanese-mac-wireless-k eyboard-on

Tom Gewecke Thanks for the previous two links. Very helpful.

Tenadona wrote:

I have already checked this tumbler's post and could not download "bridge" driver.

I don't think that driver matters for you, but did you also do steps 2 and 3 mentioned in that post? Or the stuff recommended in the other link, where it says

"go to Control Panel>Region and Language>Keyboards and Languages>Change Keyboards>Microsoft IME>Properties>Editing>Key Template>Advanced and scroll down to the Eisuu key, click assign, and click yes on the dialogue. In addition, scroll down to the Romaji (ローマ字) key and click on assign, and assign it to your Kana key. This way, your Kana key will switch from English to your last used Kana input method (either Romaji - typing with an English keyboard, where a = a (あ); or Kana - Japanese keyboard layout, where a = chi (ち).Click ok to to exit out of the windows you opened up and you're all set."