Skyrim New Game Crash Fix?

Hi, i've had Skyrim on PC for atleast a year now. Since then i have had no hardware changes at all. I recently re-installed Skyrim, with no mod's, then i started a new game. It performed well until the moment where the dragon lands on the tower: as it is about to roar it crashes straight to the Desktop. I've tried all the fixes i can think: Soundcard refresh rate fix, re-installing the game, deleting the latest patch. The list goes on and on. Sadly it still doesn't work. I would appriciate any help given.

My PC Spec's are:

  • Intel Core i5-3470 3.20GHz,
  • Gigabyte Motherboard (Can't remember what),
  • Sapphire Radeon 7850 Overclocked,
  • OCZ 650watt 80+ Bronze Non Modular PSU,
  • 2TB Seagate Barracuda Sata 3 7200RPM 6GB/s HHD,
  • Some old crappy IDE 350gb drive for backups,
  • 8gb DDR3 Dual Channel 1866mhz,
  • Asus Xonar DS Sound Card, 
  • Nice and sexy 5.1 surround sound system,