Probleme ecran bleu

Bonjour,
voila g un probleme avec mon pc o soir il affiche un ecran bleu ki affiche :

a problem has been detected and windows has been shut down to prevent dommage to your computer.if this is the first time you've seen this stop erreur screen restart you computer.if this screen appears again follow these step...

et sa se produit kan jouvre plein de fenetre !! Help Me Please !!!

Configuration: Windows Vista
Firefox 2.0