Sometimes you may accidentally press some random keys that switch your default keyboard settings over to another language which can produce accents over letters, such as: è 

To fix this:

Click start, control panel, and then select "Region and Language"

On the first tab, ensure English (Canada) is selected

Then click the "Keyboards and Languages" tab and hit the "Change Keyboards" button

The default langage input should be: English (Canada) - US

Under "Installed Services" you will probably see bullets for "Canadian French" and "Canadian Multilingual Standard"

You can click on both of those services and click the Remove button.

Restart your computer and your problem should be corrected.