If your main language is not English, you may have set your PC’s input setting to something else. On Windows 7, this was a per application setting, however that changed on Windows 8.
On Windows 7, you could specify a different input language depending on what application you were using. This meant that you could have Microsoft Office open with the input language set to Russian and open a command prompt Windows with the input language to English. When you decided to switch back to Office, the input language would be set back to Russian. This changed for the worse in Windows 8, as the input language is now universal across all applications. To change this behavior to that of Windows 7, press the Win + X keyboard combination to bring up the WinX menu and click on Control Panel.