Unable to start Windows XP in Compaq Laptop

Hi! I am facing error when starting my HP Compaq Presario V2000. I got an error message when booting it today. The error is, “Failed to start window, please mark the message below and contract "take your own risk" for technical support.” What is this error all about? My laptop is working great since the last time of using it but I can’t seem to make it work now. Can someone please help me? I am running Windows XP Home Premium. Thanks.
