The its not loading Windows. Either Windows is corrupt or the drive is faulty. If you have a Recovery Disk, try that. If not try -
Boot into Safe Mode (F8 per http://windows.microsoft.com/en-au/windows/advanced-startup-options-including-safe-mode#1TC=windows-7) and do a Computer Repair. If that doesn't work, try a Last Known Good Configuration (system restore). If that doesn't work then try a Windows re-install.