win 7 has a keyboard icon in the taskbar. Click it and you can change your keyboard layout. Happens from time to time to me too that it changes the default automatically.
Windows 8 has a different way but looks like this is how to solve it:
To make a keyboard your default keyboard
To set a keyboard as your default keyboard, follow these steps:
Swipe in from the right edge of the screen, and then tap Search.
(If you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search.)
Enter language, choose Settings, and then tap or click Add a language.
Tap or click Advanced settings.
Under Override for default input method, choose the keyboard layout you'd like to be your default keyboard, and then tap or click Save.
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