Win9 64bit, MA-770 Gigabyte, 8 Mb Ram, 6750 ATi 2Gig card Xonar D2 sound (tested on Realtek on board, crash happened exactly same instance).
Firstly this is not the software issue forums.
Secondly get more information on your setup.
Your currently lacking :
CPU (speed / model)
HDD setup
Graphics driver version
Your ram either is 8mbs and your trolling or 8gbs.
Display setup, if its a 1080p monitor then just say that...
I can't say my guess would be anything near right, but as it stands if your crashing to desktop IE no BSOD I'd suggest updating video drivers, and go after a Xonar D2 driver update as well just to be safe.
Secondly run a benchmark and see if your coming somewhat close to something equal to your setup. Thirdly it could be that either the installation went wrong, or the download is corrupt.
I'm on a somewhat better system, and never had a crash whatsoever, and I'm using a ATI card as well, so don't let people throw that excuse at you. It might be the model of the card, but ati and Nvidia cards are capable of running skyrim without to much of a issue.