If you are having an issue with your keyboard changing languages on you might have hit “Alt + SHIFT simultaneously”. Sometimes if a key is sticky and then you hit shift or alt then it will automatically change on you. To prevent this I normally only have one language setup on my machine. Manufactures like HP and Dell by default will setup a machine with both official languages. The first thing I do is make these changes. The screenshots are all done on a Windows 7 machine but it will be similar if you are running Windows Vista.
Open Control pannel from the Start menu.
Type “language” in the search box at the top right of the screen. Click “Change keyboards and other input methods”.
Click on “Change keyboards”.
Make sure that you only have either English “Canadian” or “United States”. Remove Any “Multilingual” or “French Keyboards”. Use only one keyboard. I tend to find that this configuration works best for me.
Hit Apply and Ok. Voila. You’re done.