Irene, You just made my day!Person could be from France, Quebec or other 28 countires, where
Français is an official language.
TheNoobseeker, you might have a problem with Themes, particularly you screenshot looks like
High contrast White theme. Please try to apply other themes like Standard Aero or Basic, and report if it changes anything.
Open Personalization by clicking the Start button 
, and then clicking Control Panel. In the search box, type personalization, and then click Personalization.
Pour ouvrir Personnalisation, cliquez sur le bouton Démarrer
, puis sur Panneau de configuration. Dans la zone de recherche, tapez personnalisation, puis cliquez sur Personnalisation.
As alternative I would go through MS Office 2007 styles: Click on the Office button - Excel Options - Popular tab - Color scheme.